1 | /* |
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2 | * sys_exit.c - Kernel function implementing the "exit" system call. |
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3 | * |
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4 | * Author Alain Greiner (2016,2017) |
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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 <kernel_config.h> |
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25 | #include <hal_types.h> |
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26 | #include <hal_irqmask.h> |
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27 | #include <errno.h> |
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28 | #include <thread.h> |
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29 | #include <printk.h> |
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30 | #include <process.h> |
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31 | #include <shared_syscalls.h> |
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32 | #include <cluster.h> |
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33 | #include <rpc.h> |
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34 | |
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35 | /////////////////////////////// |
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36 | int sys_exit( uint32_t status ) |
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37 | { |
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38 | reg_t save_sr; // required to enable IRQs |
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39 | |
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40 | thread_t * this = CURRENT_THREAD; |
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41 | process_t * process = this->process; |
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42 | pid_t pid = process->pid; |
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43 | trdid_t trdid = this->trdid; |
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44 | |
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45 | #if CONFIG_DEBUG_SYS_EXIT |
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46 | uint64_t tm_start; |
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47 | uint64_t tm_end; |
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48 | tm_start = hal_get_cycles(); |
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49 | if( CONFIG_DEBUG_SYS_EXIT < tm_start ) |
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50 | printk("\n[DBG] %s : thread %x enter / process %x / status %x / cycle %d\n", |
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51 | __FUNCTION__ , this, pid , status , (uint32_t)tm_start ); |
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52 | #endif |
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53 | |
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54 | // get owner cluster |
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55 | cxy_t owner_cxy = CXY_FROM_PID( pid ); |
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56 | |
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57 | // exit must be called by the main thread |
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58 | if( (owner_cxy != local_cxy) || (LTID_FROM_TRDID( trdid ) != 0) ) |
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59 | { |
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60 | |
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61 | #if CONFIG_DEBUG_SYSCALLS_ERROR |
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62 | printk("\n[ERROR] in %s : calling thread %x is not thread 0 in owner cluster %x\n", |
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63 | __FUNCTION__, trdid, owner_cxy ); |
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64 | #endif |
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65 | this->errno = EINVAL; |
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66 | return -1; |
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67 | } |
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68 | |
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69 | // enable IRQs |
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70 | hal_enable_irq( &save_sr ); |
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71 | |
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72 | // register exit_status in owner process descriptor |
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73 | process->term_state = status; |
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74 | |
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75 | #if( CONFIG_DEBUG_SYS_EXIT & 1) |
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76 | printk("\n[DBG] %s : set exit status in process term_state\n", __FUNCTION__); |
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77 | #endif |
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78 | |
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79 | // remove process from TXT list |
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80 | process_txt_detach( XPTR( local_cxy , process ) ); |
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81 | |
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82 | #if( CONFIG_DEBUG_SYS_EXIT & 1) |
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83 | printk("\n[DBG] %s : removed from TXT list\n", __FUNCTION__); |
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84 | #endif |
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85 | |
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86 | // mark for delete all process threads in all clusters (but the main) |
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87 | process_sigaction( pid , DELETE_ALL_THREADS ); |
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88 | |
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89 | #if( CONFIG_DEBUG_SYS_EXIT & 1) |
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90 | printk("\n[DBG] %s : deleted all other threads than main\n", __FUNCTION__); |
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91 | #endif |
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92 | |
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93 | // restore IRQs |
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94 | hal_restore_irq( save_sr ); |
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95 | |
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96 | // block the main thread itself |
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97 | thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_GLOBAL ); |
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98 | |
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99 | #if( CONFIG_DEBUG_SYS_EXIT & 1) |
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100 | printk("\n[DBG] %s : blocked the main thread\n", __FUNCTION__); |
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101 | #endif |
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102 | |
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103 | // atomically update owner process descriptor term_state to ask |
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104 | // the parent process sys_wait() function to delete this main thread |
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105 | hal_remote_atomic_or( XPTR( local_cxy , &process->term_state ) , |
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106 | PROCESS_TERM_EXIT ); |
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107 | |
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108 | #if( CONFIG_DEBUG_SYS_EXIT & 1) |
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109 | printk("\n[DBG] %s : set EXIT flag in process term_state\n", __FUNCTION__); |
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110 | #endif |
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111 | |
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112 | hal_fence(); |
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113 | |
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114 | #if CONFIG_DEBUG_SYS_EXIT |
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115 | tm_end = hal_get_cycles(); |
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116 | if( CONFIG_DEBUG_SYS_EXIT < tm_end ) |
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117 | printk("\n[DBG] %s : thread %x exit / process %x / status %x / cost = %d / cycle %d\n", |
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118 | __FUNCTION__, this, pid, status, (uint32_t)(tm_end - tm_start), (uint32_t)tm_end ); |
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119 | #endif |
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120 | |
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121 | // main thread deschedule |
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122 | sched_yield( "process exit" ); |
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123 | |
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124 | // this code should never be executed |
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125 | assert( false , __FUNCTION__ , "this code should not be executed...\n" ); |
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126 | return 0; |
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127 | |
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128 | } // end sys_exit() |
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129 | |
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