| 1 | /* |
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| 2 | * sys_thread_detach.c - detach a joinable thread |
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| 3 | * |
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| 4 | * Authors Alain Greiner (2016,2017,2018,2019) |
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| 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_kernel_types.h> |
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| 25 | #include <hal_remote.h> |
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| 26 | #include <hal_special.h> |
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| 27 | #include <thread.h> |
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| 28 | #include <errno.h> |
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| 29 | #include <printk.h> |
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| 30 | |
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| 31 | #include <syscalls.h> |
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| 32 | |
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| 33 | ////////////////////////////////////// |
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| 34 | int sys_thread_detach( trdid_t trdid ) |
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| 35 | { |
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| 36 | xptr_t target_xp; |
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| 37 | thread_t * target_ptr; |
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| 38 | cxy_t target_cxy; |
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| 39 | ltid_t target_ltid; |
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| 40 | uint32_t flags; |
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| 41 | |
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| 42 | thread_t * this = CURRENT_THREAD; |
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| 43 | process_t * process = this->process; |
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| 44 | |
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| 45 | // get target thread ltid and cxy |
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| 46 | target_ltid = LTID_FROM_TRDID( trdid ); |
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| 47 | target_cxy = CXY_FROM_TRDID( trdid ); |
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| 48 | |
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| 49 | // check trdid argument |
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| 50 | if( (target_ltid >= CONFIG_THREADS_MAX_PER_CLUSTER) || |
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| 51 | (cluster_is_active( target_cxy ) == false) ) |
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| 52 | { |
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| 53 | printk("\n[ERROR] in %s : illegal trdid argument\n", __FUNCTION__ ); |
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| 54 | this->errno = EINVAL; |
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| 55 | return -1; |
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| 56 | } |
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| 57 | |
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| 58 | // get extended pointer on target thread |
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| 59 | target_xp = thread_get_xptr( process->pid , trdid ); |
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| 60 | |
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| 61 | if( target_xp == XPTR_NULL ) |
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| 62 | { |
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| 63 | printk("\n[ERROR] in %s : target thread not found\n", __FUNCTION__ ); |
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| 64 | this->errno = ESRCH; |
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| 65 | return -1; |
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| 66 | } |
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| 67 | |
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| 68 | // get local pointer on target thread |
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| 69 | target_ptr = (thread_t *)GET_PTR( target_xp ); |
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| 70 | |
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| 71 | // get target thread flags |
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| 72 | flags = hal_remote_l32( XPTR( target_cxy , &target_ptr->flags ) ); |
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| 73 | |
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| 74 | // check target thread joinable |
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| 75 | if( flags & THREAD_FLAG_DETACHED ) |
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| 76 | { |
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| 77 | printk("\n[ERROR] in %s : target thread not joinable\n", __FUNCTION__ ); |
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| 78 | this->errno = EINVAL; |
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| 79 | return -1; |
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| 80 | } |
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| 81 | |
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| 82 | // atomically set the thread DETACHED flag |
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| 83 | hal_remote_atomic_or( XPTR( target_cxy , &target_ptr->flags ) , THREAD_FLAG_DETACHED ); |
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| 84 | |
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| 85 | return 0; |
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| 86 | |
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| 87 | } // end sys_thread_detach() |
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