[439] | 1 | /* |
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[457] | 2 | * pthread.c - User level <pthread> library implementation. |
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[439] | 3 | * |
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[619] | 4 | * Author Alain Greiner (2016,2017,2018,2019) |
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[439] | 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #include <hal_user.h> |
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[457] | 25 | #include <hal_shared_types.h> |
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[439] | 26 | #include <stdio.h> |
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| 27 | #include <stdlib.h> |
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| 28 | #include <pthread.h> |
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[457] | 29 | #include <shared_pthread.h> |
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[445] | 30 | #include <almosmkh.h> |
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[444] | 31 | #include <syscalls_numbers.h> |
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[439] | 32 | |
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| 33 | |
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| 34 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 35 | // Threads |
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| 36 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 37 | |
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| 38 | ///////////////////////////////////////////////// |
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| 39 | int pthread_create( pthread_t * trdid, |
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| 40 | const pthread_attr_t * attr, |
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| 41 | void * start_func, |
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| 42 | void * start_args ) |
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| 43 | { |
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| 44 | return hal_user_syscall( SYS_THREAD_CREATE, |
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| 45 | (reg_t)trdid, |
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| 46 | (reg_t)attr, |
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| 47 | (reg_t)start_func, |
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| 48 | (reg_t)start_args ); |
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| 49 | } |
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| 50 | |
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| 51 | ///////////////////////////////////// |
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| 52 | int pthread_join( pthread_t trdid, |
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| 53 | void ** exit_value ) |
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| 54 | { |
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| 55 | return hal_user_syscall( SYS_THREAD_JOIN, |
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[473] | 56 | (reg_t)trdid, |
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| 57 | (reg_t)exit_value, 0, 0 ); |
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[439] | 58 | } |
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| 59 | |
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| 60 | /////////////////////////////////////// |
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| 61 | int pthread_detach( pthread_t trdid ) |
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| 62 | { |
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| 63 | return hal_user_syscall( SYS_THREAD_DETACH, |
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| 64 | (reg_t)trdid, 0, 0, 0 ); |
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| 65 | } |
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| 66 | |
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| 67 | ///////////////////////////////////// |
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| 68 | int pthread_exit( void * exit_value ) |
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| 69 | { |
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| 70 | return hal_user_syscall( SYS_THREAD_EXIT, |
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| 71 | (reg_t)exit_value, 0, 0, 0 ); |
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| 72 | } |
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| 73 | |
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[581] | 74 | ///////////////////////// |
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[477] | 75 | int pthread_yield( void ) |
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[439] | 76 | { |
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| 77 | return hal_user_syscall( SYS_THREAD_YIELD, 0, 0, 0, 0 ); |
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| 78 | } |
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| 79 | |
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| 80 | //////////////////////////////////////////////////////////////////////////////////////////// |
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[581] | 81 | // Mutexes |
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| 82 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 83 | |
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| 84 | ////////////////////////////////////////////////////////// |
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| 85 | int pthread_mutex_init( pthread_mutex_t * mutex, |
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| 86 | const pthread_mutexattr_t * attr ) |
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| 87 | { |
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| 88 | if( attr != NULL ) |
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| 89 | { |
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| 90 | printf("\n[ERROR] in %s : <attr> argument not supported\n", __FUNCTION__); |
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| 91 | return -1; |
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| 92 | } |
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| 93 | |
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| 94 | return hal_user_syscall( SYS_MUTEX, |
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| 95 | (reg_t)mutex, |
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| 96 | MUTEX_INIT, |
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| 97 | 0, 0 ); |
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| 98 | } |
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| 99 | |
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| 100 | //////////////////////////////////////////////////// |
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| 101 | int pthread_mutex_destroy( pthread_mutex_t * mutex ) |
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| 102 | { |
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| 103 | return hal_user_syscall( SYS_MUTEX, |
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| 104 | (reg_t)mutex, |
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| 105 | MUTEX_DESTROY, |
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| 106 | 0, 0 ); |
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| 107 | } |
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| 108 | |
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| 109 | ///////////////////////////////////////////////// |
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| 110 | int pthread_mutex_lock( pthread_mutex_t * mutex ) |
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| 111 | { |
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| 112 | return hal_user_syscall( SYS_MUTEX, |
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| 113 | (reg_t)mutex, |
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| 114 | MUTEX_LOCK, |
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| 115 | 0, 0 ); |
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| 116 | } |
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| 117 | |
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| 118 | //////////////////////////////////////////////////// |
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| 119 | int pthread_mutex_trylock( pthread_mutex_t * mutex ) |
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| 120 | { |
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| 121 | return hal_user_syscall( SYS_MUTEX, |
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| 122 | (reg_t)mutex, |
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| 123 | MUTEX_TRYLOCK, |
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| 124 | 0, 0 ); |
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| 125 | } |
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| 126 | |
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| 127 | /////////////////////////////////////////////////// |
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| 128 | int pthread_mutex_unlock( pthread_mutex_t * mutex ) |
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| 129 | { |
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| 130 | return hal_user_syscall( SYS_MUTEX, |
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| 131 | (reg_t)mutex, |
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| 132 | MUTEX_UNLOCK, |
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| 133 | 0, 0 ); |
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| 134 | } |
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| 135 | |
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| 136 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 137 | // Condvars |
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| 138 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 139 | |
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| 140 | /////////////////////////////////////////////// |
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| 141 | int pthread_cond_init( pthread_cond_t * cond, |
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| 142 | pthread_condattr_t * attr ) |
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| 143 | { |
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| 144 | if( attr ) |
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| 145 | { |
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| 146 | printf("[ERROR] in %s ; <attr> argument must be NULL\n", __FUNCTION__ ); |
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| 147 | return -1; |
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| 148 | } |
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| 149 | |
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| 150 | return hal_user_syscall( SYS_CONDVAR, |
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| 151 | (reg_t)cond, |
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| 152 | CONDVAR_INIT, |
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| 153 | 0, 0 ); |
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| 154 | } |
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| 155 | |
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| 156 | ///////////////////////////////////////////////// |
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| 157 | int pthread_cond_destroy( pthread_cond_t * cond ) |
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| 158 | { |
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| 159 | return hal_user_syscall( SYS_CONDVAR, |
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| 160 | (reg_t)cond, |
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| 161 | CONDVAR_DESTROY, |
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| 162 | 0, 0 ); |
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| 163 | } |
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| 164 | |
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| 165 | ////////////////////////////////////////////// |
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| 166 | int pthread_cond_wait( pthread_cond_t * cond, |
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| 167 | pthread_mutex_t * mutex ) |
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| 168 | { |
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| 169 | return hal_user_syscall( SYS_CONDVAR, |
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| 170 | (reg_t)cond, |
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| 171 | CONDVAR_WAIT, |
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| 172 | (reg_t)mutex, |
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| 173 | 0 ); |
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| 174 | } |
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| 175 | |
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| 176 | //////////////////////////////////////////////// |
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| 177 | int pthread_cond_signal( pthread_cond_t * cond ) |
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| 178 | { |
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| 179 | return hal_user_syscall( SYS_CONDVAR, |
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| 180 | (reg_t)cond, |
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| 181 | CONDVAR_SIGNAL, |
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| 182 | 0, 0 ); |
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| 183 | } |
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| 184 | |
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| 185 | /////////////////////////////////////////////////// |
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| 186 | int pthread_cond_broadcast( pthread_cond_t * cond ) |
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| 187 | { |
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| 188 | return hal_user_syscall( SYS_CONDVAR, |
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| 189 | (reg_t)cond, |
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| 190 | CONDVAR_BROADCAST, |
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| 191 | 0, 0 ); |
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| 192 | } |
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| 193 | |
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| 194 | |
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| 195 | //////////////////////////////////////////////////////////////////////////////////////////// |
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[439] | 196 | // Barriers |
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| 197 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 198 | |
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[581] | 199 | //////////////////////////////////////////////////////////////// |
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| 200 | int pthread_barrier_init( pthread_barrier_t * barrier, |
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| 201 | const pthread_barrierattr_t * attr, |
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| 202 | unsigned int count ) |
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| 203 | { |
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| 204 | return hal_user_syscall( SYS_BARRIER, |
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| 205 | (reg_t)barrier, |
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| 206 | BARRIER_INIT, |
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| 207 | (reg_t)count, |
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[619] | 208 | (reg_t)attr ); |
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[581] | 209 | } |
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| 210 | |
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| 211 | ////////////////////////////////////////////////////////// |
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| 212 | int pthread_barrier_destroy( pthread_barrier_t * barrier ) |
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| 213 | { |
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| 214 | return hal_user_syscall( SYS_BARRIER, |
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| 215 | (reg_t)barrier, |
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| 216 | BARRIER_DESTROY, |
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| 217 | 0, 0 ); |
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| 218 | } |
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| 219 | |
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| 220 | /////////////////////////////////////////////////////// |
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| 221 | int pthread_barrier_wait( pthread_barrier_t * barrier ) |
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| 222 | { |
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| 223 | return hal_user_syscall( SYS_BARRIER, |
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| 224 | (reg_t)barrier, |
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| 225 | BARRIER_WAIT, |
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| 226 | 0, 0 ); |
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| 227 | } |
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| 228 | |
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| 229 | /* |
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| 230 | |
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[439] | 231 | //////////////////////////////////////////////////////////////////////////////////////////// |
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[581] | 232 | // The following functions define another implementation for the POSX barrier |
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| 233 | // based on a distributed quadtree implemented in user space, and relying |
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| 234 | // on a busy waiting policy. |
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| 235 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 236 | |
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| 237 | |
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| 238 | //////////////////////////////////////////////////////////////////////////////////////////// |
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[439] | 239 | // This recursive function initializes the SQT nodes |
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| 240 | // traversing the SQT from root to bottom |
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| 241 | //////////////////////////////////////////////////////////////////////////////////////////// |
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| 242 | static void sqt_barrier_build( pthread_barrier_t * barrier, |
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| 243 | unsigned int x, |
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| 244 | unsigned int y, |
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| 245 | unsigned int level, |
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| 246 | sqt_node_t * parent, |
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| 247 | unsigned int x_size, |
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| 248 | unsigned int y_size, |
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| 249 | unsigned int nthreads ) |
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| 250 | { |
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| 251 | // get target node address |
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| 252 | sqt_node_t * node = barrier->node[x][y][level]; |
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| 253 | |
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| 254 | if (level == 0 ) // terminal case |
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| 255 | { |
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| 256 | // initializes target node |
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| 257 | node->arity = nthreads; |
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| 258 | node->count = nthreads; |
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| 259 | node->sense = 0; |
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| 260 | node->level = 0; |
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| 261 | node->parent = parent; |
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| 262 | node->child[0] = NULL; |
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| 263 | node->child[1] = NULL; |
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| 264 | node->child[2] = NULL; |
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| 265 | node->child[3] = NULL; |
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| 266 | |
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| 267 | #if PTHREAD_BARRIER_DEBUG |
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[440] | 268 | printf("\n[BARRIER] %s : sqt_node[%d][%d][%d] / arity %d / desc %x\n" |
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| 269 | "parent %x / child0 %x / child1 %x / child2 %x / child3 %x\n", |
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| 270 | __FUNCTION__, x, y, level, node->arity, node, node->parent, |
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[439] | 271 | node->child[0], node->child[1], node->child[2], node->child[3] ); |
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| 272 | #endif |
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| 273 | |
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| 274 | } |
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| 275 | else // non terminal case |
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| 276 | { |
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| 277 | unsigned int cx[4]; // x coordinate for children |
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| 278 | unsigned int cy[4]; // y coordinate for children |
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| 279 | unsigned int arity = 0; |
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| 280 | unsigned int i; |
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| 281 | |
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| 282 | // the child0 coordinates are equal to the parent coordinates |
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| 283 | // other children coordinates are incremented depending on the level value |
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| 284 | cx[0] = x; |
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| 285 | cy[0] = y; |
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| 286 | |
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| 287 | cx[1] = x; |
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| 288 | cy[1] = y + (1 << (level-1)); |
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| 289 | |
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| 290 | cx[2] = x + (1 << (level-1)); |
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| 291 | cy[2] = y; |
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| 292 | |
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| 293 | cx[3] = x + (1 << (level-1)); |
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| 294 | cy[3] = y + (1 << (level-1)); |
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| 295 | |
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| 296 | // initializes parent node taken into account the actual number of childs |
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| 297 | // child pointer is NULL if coordinates outside the mesh |
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| 298 | for ( i = 0 ; i < 4 ; i++ ) |
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| 299 | { |
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| 300 | if ( (cx[i] < x_size) && (cy[i] < y_size) ) |
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| 301 | { |
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| 302 | node->child[i] = barrier->node[cx[i]][cy[i]][level-1]; |
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| 303 | arity++; |
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| 304 | } |
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| 305 | else node->child[i] = NULL; |
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| 306 | } |
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| 307 | node->arity = arity; |
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| 308 | node->count = arity; |
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| 309 | node->sense = 0; |
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| 310 | node->level = level; |
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| 311 | node->parent = parent; |
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| 312 | |
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| 313 | #if PTHREAD_BARRIER_DEBUG |
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[440] | 314 | printf("\n[BARRIER] %s : sqt_node[%d][%d][%d] / arity %d / desc %x\n" |
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| 315 | "parent %x / child0 %x / child1 %x / child2 %x / child3 %x\n", |
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| 316 | __FUNCTION__, x, y, level, node->arity, node, node->parent, |
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[439] | 317 | node->child[0], node->child[1], node->child[2], node->child[3] ); |
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| 318 | #endif |
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| 319 | |
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| 320 | // recursive calls for children nodes |
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| 321 | for ( i = 0 ; i < 4 ; i++ ) |
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| 322 | { |
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| 323 | if ( (cx[i] < x_size) && (cy[i] < y_size) ) |
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| 324 | sqt_barrier_build( barrier, |
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| 325 | cx[i], |
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| 326 | cy[i], |
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| 327 | level-1, |
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| 328 | node, |
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| 329 | x_size, |
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| 330 | y_size, |
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| 331 | nthreads ); |
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| 332 | } |
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| 333 | } |
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| 334 | } // end sqt_barrier_build() |
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| 335 | |
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| 336 | //////////////////////////////////////////////////////////////// |
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| 337 | int pthread_barrier_init( pthread_barrier_t * barrier, |
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| 338 | const pthread_barrierattr_t * attr, |
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| 339 | unsigned int count ) |
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| 340 | { |
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| 341 | unsigned int x_size; |
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| 342 | unsigned int y_size; |
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| 343 | unsigned int nthreads; |
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| 344 | |
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| 345 | if( attr != NULL ) |
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| 346 | { |
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| 347 | x_size = attr->x_size; |
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| 348 | y_size = attr->y_size; |
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| 349 | nthreads = attr->nthreads; |
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| 350 | } |
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| 351 | else |
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| 352 | { |
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| 353 | x_size = 1; |
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| 354 | y_size = 1; |
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| 355 | nthreads = count; |
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| 356 | } |
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| 357 | |
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[619] | 358 | // check attributes / count |
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[445] | 359 | if( (x_size * y_size * nthreads) != count ) |
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| 360 | { |
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| 361 | printf("\[ERROR] in %s : count != x_size * y_size * nthreads/n", __FUNCTION__); |
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| 362 | exit( EXIT_FAILURE ); |
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| 363 | } |
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[439] | 364 | |
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| 365 | // compute SQT levels |
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| 366 | unsigned int levels; |
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| 367 | unsigned int z = (x_size > y_size) ? x_size : y_size; |
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| 368 | levels = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 3 : (z < 9) ? 4 : 5; |
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| 369 | |
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| 370 | #if PTHREAD_BARRIER_DEBUG |
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| 371 | unsigned int side = (z < 2) ? 1 : (z < 3) ? 2 : (z < 5) ? 4 : (z < 9) ? 8 : 16; |
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| 372 | printf("\n[BARRIER] %s : x_size = %d / y_size = %d / levels = %d / side = %d\n", |
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| 373 | __FUNCTION__ , x_size , y_size , levels , side ); |
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| 374 | #endif |
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| 375 | |
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| 376 | // allocates memory for the SQT nodes and initializes SQT nodes pointers array |
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| 377 | // the actual number of SQT nodes in a cluster(x,y) depends on (x,y): |
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| 378 | // At least 1 node / at most 5 nodes |
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| 379 | unsigned int x; // x coordinate for one SQT node |
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| 380 | unsigned int y; // y coordinate for one SQT node |
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| 381 | unsigned int l; // level for one SQT node |
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| 382 | for ( x = 0 ; x < x_size ; x++ ) |
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| 383 | { |
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| 384 | for ( y = 0 ; y < y_size ; y++ ) |
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| 385 | { |
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| 386 | unsigned int cxy = (x<<QDT_YWIDTH) + y; |
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| 387 | |
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| 388 | for ( l = 0 ; l < levels ; l++ ) |
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| 389 | { |
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| 390 | if ( ( (l == 0) && ((x&0x00) == 0) && ((y&0x00) == 0) ) || |
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| 391 | ( (l == 1) && ((x&0x01) == 0) && ((y&0x01) == 0) ) || |
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| 392 | ( (l == 2) && ((x&0x03) == 0) && ((y&0x03) == 0) ) || |
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| 393 | ( (l == 3) && ((x&0x07) == 0) && ((y&0x07) == 0) ) || |
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| 394 | ( (l == 4) && ((x&0x0F) == 0) && ((y&0x0F) == 0) ) ) |
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| 395 | { |
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| 396 | sqt_node_t * node = remote_malloc( sizeof(sqt_node_t) , cxy ); |
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| 397 | |
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| 398 | if( node == NULL ) |
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| 399 | { |
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| 400 | printf("\n[ERROR] in %s : cannot allocate sqt_node in cluster %x\n", |
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| 401 | __FUNCTION__ , cxy ); |
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| 402 | return -1; |
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| 403 | } |
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| 404 | |
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| 405 | barrier->node[x][y][l] = node; |
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| 406 | |
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| 407 | } |
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| 408 | } |
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| 409 | } |
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| 410 | } |
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| 411 | |
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| 412 | // recursively initialize all SQT nodes from root to bottom |
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| 413 | sqt_barrier_build( barrier, |
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| 414 | 0, |
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| 415 | 0, |
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| 416 | levels-1, |
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| 417 | NULL, |
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| 418 | x_size, |
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| 419 | y_size, |
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| 420 | nthreads ); |
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| 421 | |
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| 422 | hal_user_fence(); |
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| 423 | |
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| 424 | return 0; |
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| 425 | |
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| 426 | } // end pthread_barrier_init |
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| 427 | |
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| 428 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 429 | // This recursive function decrements the distributed "count" variables, |
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| 430 | // traversing the SQT from bottom to root. |
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| 431 | // The last arrived thread reset the local node before returning. |
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| 432 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 433 | static void sqt_barrier_decrement( sqt_node_t * node ) |
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| 434 | { |
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| 435 | |
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| 436 | #if PTHREAD_BARRIER_DEBUG |
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| 437 | unsigned int cxy; |
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| 438 | unsigned int lid; |
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| 439 | get_core( &cxy , &lid ); |
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| 440 | printf("\n[BARRIER] %s : core[%x,%d] decrement SQT barrier node %x :\n" |
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| 441 | " level = %d / parent = %x / arity = %d / sense = %d / count = %d\n", |
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| 442 | __FUNCTION__ , cxy , lid , (unsigned int)node , |
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| 443 | node->level , node->parent, node->arity , node->sense , node->count ); |
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| 444 | #endif |
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| 445 | |
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| 446 | unsigned int expected; |
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| 447 | |
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| 448 | // compute expected sense value |
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| 449 | if ( node->sense == 0) expected = 1; |
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| 450 | else expected = 0; |
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| 451 | |
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| 452 | // atomically decrement count |
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| 453 | int count = hal_user_atomic_add( (int *)&node->count , -1 ); |
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| 454 | |
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| 455 | // last arrived thread makes the recursive call |
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| 456 | if ( count == 1 ) // last thread |
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| 457 | { |
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| 458 | // decrement the parent node if the current node is not the root |
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| 459 | if ( node->parent != NULL ) sqt_barrier_decrement( node->parent ); |
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| 460 | |
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| 461 | #if PTHREAD_BARRIER_DEBUG |
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| 462 | printf("\n[BARRIER] %s : core[%x,%d] reset SQT barrier node %x :\n" |
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| 463 | " level = %d / arity = %d / sense = %d / count = %d\n", |
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| 464 | __FUNCTION__ , cxy , lid , (unsigned int)node , |
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| 465 | node->level , node->arity , node->sense , node->count ); |
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| 466 | #endif |
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[573] | 467 | // reset the current node |
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| 468 | node->sense = expected; |
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| 469 | node->count = node->arity; |
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| 470 | |
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[439] | 471 | return; |
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| 472 | } |
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| 473 | else // not the last thread |
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| 474 | { |
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| 475 | while( 1 ) |
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| 476 | { |
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[445] | 477 | // poll sense |
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[439] | 478 | if( node->sense == expected ) break; |
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[445] | 479 | |
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| 480 | // deschedule |
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| 481 | pthread_yield(); |
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[439] | 482 | } |
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| 483 | |
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| 484 | return; |
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| 485 | } |
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| 486 | } // end sqt_barrier_decrement() |
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| 487 | |
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| 488 | /////////////////////////////////////////////////////// |
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| 489 | int pthread_barrier_wait( pthread_barrier_t * barrier ) |
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| 490 | { |
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| 491 | // get calling core cluster |
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| 492 | unsigned int cxy; |
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| 493 | unsigned int lid; |
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| 494 | get_core( &cxy , &lid ); |
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| 495 | |
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| 496 | // get calling core coordinate |
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| 497 | unsigned int x = cxy >> QDT_YWIDTH; |
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| 498 | unsigned int y = cxy & QDT_YMASK; |
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| 499 | |
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| 500 | #if PTHREAD_BARRIER_DEBUG |
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[473] | 501 | printf("\n[BARRIER] %s : core[%x,%d] enter / barrier = %x / node = %x\n", |
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[439] | 502 | __FUNCTION__ , cxy , lid , barrier, barrier->node[x][y][0] ); |
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| 503 | #endif |
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| 504 | |
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| 505 | // recursively decrement count from bottom to root |
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| 506 | sqt_barrier_decrement( barrier->node[x][y][0] ); |
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| 507 | |
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| 508 | hal_user_fence(); |
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| 509 | |
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| 510 | return 0; |
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| 511 | |
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| 512 | } // end pthread_barrier_wait() |
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| 513 | |
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[581] | 514 | */ |
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[439] | 515 | |
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| 516 | |
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| 517 | |
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| 518 | // Local Variables: |
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| 519 | // tab-width: 4 |
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| 520 | // c-basic-offset: 4 |
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| 521 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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| 522 | // indent-tabs-mode: nil |
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| 523 | // End: |
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| 524 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 525 | |
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