| 1 | /*
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| 2 | * sys_thread_cancel.c - terminate execution of an user thread.
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| 3 | *
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| 4 | * Authors Alain Greiner (2016,2017, 2018)
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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 <hal_remote.h>
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| 27 | #include <hal_special.h>
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| 28 | #include <thread.h>
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| 29 | #include <errno.h>
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| 30 | #include <printk.h>
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| 31 |
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| 32 | //////////////////////////////////////
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| 33 | int sys_thread_cancel( trdid_t trdid )
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| 34 | {
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| 35 | reg_t save_sr; // required to enable IRQs
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| 36 | xptr_t target_xp; // target thread extended pointer
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| 37 | cxy_t target_cxy; // target thread cluster identifier
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| 38 | ltid_t target_ltid; // target thread local index
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| 39 | xptr_t owner_xp; // extended pointer on owner process
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| 40 | cxy_t owner_cxy; // process owner cluster identifier
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| 41 |
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| 42 | // get killer thread pointers
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| 43 | thread_t * this = CURRENT_THREAD;
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| 44 | process_t * process = this->process;
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| 45 | pid_t pid = process->pid;
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| 46 |
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| 47 | #if DEBUG_SYS_THREAD_CANCEL
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| 48 | uint64_t tm_start;
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| 49 | uint64_t tm_end;
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| 50 | tm_start = hal_get_cycles();
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| 51 | if( DEBUG_SYS_THREAD_CANCEL < tm_start )
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| 52 | printk("\n[DBG] %s : thread %x enter to kill thread %x in process %x / cycle %d\n",
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| 53 | __FUNCTION__, this , trdid , pid , (uint32_t)tm_start );
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| 54 | #endif
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| 55 |
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| 56 | // get extended pointer on target thread
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| 57 | target_xp = thread_get_xptr( pid , trdid );
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| 58 |
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| 59 | // check target_xp
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| 60 | if( target_xp == XPTR_NULL )
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| 61 | {
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| 62 |
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| 63 | #if DEBUG_SYSCALLS_ERROR
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| 64 | printk("\n[ERROR] in %s : target thread %x not found\n", __FUNCTION__, trdid );
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| 65 | #endif
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| 66 | this->errno = EINVAL;
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| 67 | return -1;
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| 68 | }
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| 69 |
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| 70 | // get process owner cluster
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| 71 | owner_xp = process->owner_xp;
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| 72 | owner_cxy = GET_CXY( owner_xp );
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| 73 |
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| 74 | // get target thread ltid and cluster
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| 75 | target_cxy = CXY_FROM_TRDID( trdid );
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| 76 | target_ltid = LTID_FROM_TRDID( trdid );
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| 77 |
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| 78 | // If target thread is the main thread, the process must be deleted,
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| 79 | // This require synchronisation with parent process
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| 80 | if( (target_cxy == owner_cxy) && (target_ltid == 0) )
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| 81 | {
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| 82 | // mark for delete all threads but the main
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| 83 | hal_enable_irq( &save_sr );
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| 84 | process_sigaction( pid , DELETE_ALL_THREADS );
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| 85 | hal_restore_irq( save_sr );
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| 86 |
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| 87 | // remove process from TXT list
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| 88 | process_txt_detach( owner_xp );
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| 89 |
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| 90 | // block the main thread
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| 91 | thread_block( XPTR( local_cxy ,this ) , THREAD_BLOCKED_GLOBAL );
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| 92 |
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| 93 | // atomically update owner process descriptor term_state to ask
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| 94 | // the parent process sys_wait() function to delete the main thread
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| 95 | hal_remote_atomic_or( XPTR( local_cxy , &process->term_state ) ,
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| 96 | PROCESS_TERM_EXIT );
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| 97 | }
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| 98 | else
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| 99 | {
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| 100 | // block target thread and mark it for delete
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| 101 | thread_delete( target_xp , pid , false );
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| 102 | }
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| 103 |
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| 104 | #if DEBUG_SYS_THREAD_CANCEL
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| 105 | tm_end = hal_get_cycles();
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| 106 | if( DEBUG_SYS_THREAD_CANCEL < tm_end )
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| 107 | printk("\n[DBG] %s : thread %x exit after kill thread %x in process %x / cycle %d\n",
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| 108 | __FUNCTION__, this , trdid , pid , (uint32_t)tm_end );
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| 109 | #endif
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| 110 |
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| 111 | return 0;
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| 112 |
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| 113 | } // end sys_thread_cancel()
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