1 | /* |
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2 | * sys_thread_exit.c - terminates the execution of calling thread |
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3 | * |
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4 | * Authors Alain Greiner (2016,2017,2018,2019,2020) |
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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_irqmask.h> |
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26 | #include <thread.h> |
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27 | #include <process.h> |
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28 | #include <core.h> |
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29 | #include <vmm.h> |
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30 | #include <scheduler.h> |
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31 | #include <printk.h> |
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32 | |
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33 | #include <syscalls.h> |
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34 | |
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35 | ///////////////////////////////////////// |
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36 | int sys_thread_exit( void * exit_status ) |
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37 | { |
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38 | error_t error; |
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39 | vseg_t * vseg; |
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40 | |
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41 | thread_t * this = CURRENT_THREAD; |
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42 | trdid_t trdid = this->trdid; |
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43 | process_t * process = this->process; |
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44 | pid_t pid = process->pid; |
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45 | |
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46 | #if DEBUG_SYS_THREAD_EXIT || DEBUG_SYSCALLS_ERROR |
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47 | uint64_t tm_start = hal_get_cycles(); |
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48 | #endif |
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49 | |
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50 | // check exit_value pointer in user space if required |
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51 | if( exit_status != NULL ) |
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52 | { |
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53 | error = vmm_get_vseg( process , (intptr_t)exit_status , &vseg ); |
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54 | |
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55 | if( error ) |
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56 | { |
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57 | |
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58 | #if DEBUG_SYSCALLS_ERROR |
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59 | if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start ) |
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60 | printk("\n[WARNING] in %s : exit_status buffer %x unmapped / thread[%x,%x]\n", |
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61 | __FUNCTION__, (intptr_t)exit_status, pid, trdid ); |
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62 | #endif |
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63 | this->errno = EINVAL; |
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64 | return -1; |
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65 | } |
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66 | } |
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67 | |
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68 | // check busylocks |
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69 | uint32_t count = this->busylocks; |
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70 | if( count ) |
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71 | { |
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72 | |
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73 | #if DEBUG_SYSCALLS_ERROR |
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74 | if( DEBUG_SYSCALLS_ERROR < (uint32_t)tm_start ) |
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75 | printk("\n[WARNING] in %s : busylocks count = %d / thread[%x,%x]\n", |
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76 | __FUNCTION__ , count, pid, trdid ); |
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77 | #endif |
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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 | // If calling thread is the main thread, the process must be deleted. |
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83 | // => delete all process threads and synchronize with parent process. |
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84 | // If calling thread is not the main thread, only this thread must be deleted. |
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85 | // => register exit_status in thread descriptor, block the thread, |
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86 | // mark it for delete, and synchronize with joining thread. |
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87 | |
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88 | if( (CXY_FROM_PID( pid ) == local_cxy) && (LTID_FROM_TRDID(trdid) == 0) ) // main |
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89 | { |
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90 | |
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91 | #if DEBUG_SYS_THREAD_EXIT |
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92 | if( DEBUG_SYS_THREAD_EXIT < (uint32_t)tm_start ) |
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93 | printk("\n[%s] thread[%x,%x] is main => delete process / cycle %d\n", |
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94 | __FUNCTION__ , pid , trdid , (uint32_t)tm_start ); |
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95 | #endif |
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96 | // delete process |
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97 | sys_exit( 0 ); |
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98 | } |
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99 | else // not the main |
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100 | { |
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101 | |
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102 | #if DEBUG_SYS_THREAD_EXIT |
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103 | if( DEBUG_SYS_THREAD_EXIT < (uint32_t)tm_start ) |
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104 | printk("\n[%s] thread[%x,%x] is not main => delete thread / cycle %d\n", |
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105 | __FUNCTION__ , pid , trdid , (uint32_t)tm_start ); |
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106 | #endif |
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107 | // register exit_status in thread descriptor |
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108 | this->exit_status = exit_status; |
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109 | |
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110 | // block calling thread and mark it for delete, |
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111 | thread_delete_request( XPTR( local_cxy , this ) , false ); // not forced |
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112 | |
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113 | // deschedule |
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114 | sched_yield( "suicide after thread_exit" ); |
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115 | } |
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116 | |
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117 | return 0; // never executed but required by compiler |
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118 | |
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119 | } // end sys_thread exit |
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