| 1 | /*
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| 2 | * sys_thread_exit.c - terminates the execution of current thread
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| 3 | *
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| 4 | * Authors Ghassan Almaless (2008,2009,2010,2011,2012)
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| 5 | * Alain Greiner (2016,2017)
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| 6 | *
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| 7 | * Copyright (c) UPMC Sorbonne Universites
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| 8 | *
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| 9 | * This file is part of ALMOS-MKH.
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| 10 | *
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| 11 | * ALMOS-MKH is free software; you can redistribute it and/or modify it
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| 12 | * under the terms of the GNU General Public License as published by
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| 13 | * the Free Software Foundation; version 2.0 of the License.
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| 14 | *
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| 15 | * ALMOS-MKH is distributed in the hope that it will be useful, but
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| 16 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 18 | * General Public License for more details.
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| 19 | *
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| 20 | * You should have received a copy of the GNU General Public License
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| 21 | * along with ALMOS-MKH; if not, write to the Free Software Foundation,
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| 22 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 23 | */
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| 24 |
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| 25 | #include <hal_types.h>
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| 26 | #include <hal_irqmask.h>
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| 27 | #include <thread.h>
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| 28 | #include <core.h>
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| 29 | #include <scheduler.h>
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| 30 | #include <printk.h>
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| 31 |
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| 32 |
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| 33 | ////////////////////////////////////////
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| 34 | int sys_thread_exit( void * exit_value )
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| 35 | {
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| 36 | thread_t * this = CURRENT_THREAD;
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| 37 | core_t * core = this->core;
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| 38 | uint32_t irq_state;
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| 39 |
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| 40 | // register the exit_value in thread descriptor
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| 41 | this->exit_value = exit_value;
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| 42 |
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| 43 | // we enter the join loop to wait the join
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| 44 | // only if thread is joinable
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| 45 | if( (this->flags & THREAD_FLAG_DETACHED) == 0 )
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| 46 | {
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| 47 | while( 1 )
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| 48 | {
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| 49 | // take the lock protecting the flags
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| 50 | remote_spinlock_lock( XPTR( local_cxy, &this->flags_lock ) );
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| 51 |
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| 52 | // check the JOIN flag
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| 53 | if( this->flags & THREAD_FLAG_JOIN ) // parent made a join
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| 54 | {
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| 55 | // unblock the parent thread
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| 56 | thread_unblock( this->parent , THREAD_BLOCKED_JOIN );
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| 57 |
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| 58 | // release the lock protecting the flags
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| 59 | remote_spinlock_unlock( XPTR( local_cxy, &this->flags_lock ) );
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| 60 |
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| 61 | // exit while
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| 62 | break;
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| 63 | }
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| 64 | else // no join done by parent thread
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| 65 | {
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| 66 | // set the EXIT flag
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| 67 | this->flags |= THREAD_FLAG_EXIT;
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| 68 |
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| 69 | // block this thread
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| 70 | thread_block( this , THREAD_BLOCKED_EXIT );
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| 71 |
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| 72 | // release the lock protecting the flags
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| 73 | remote_spinlock_unlock( XPTR( local_cxy, &this->flags_lock ) );
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| 74 |
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| 75 | // deschedule
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| 76 | sched_yield();
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| 77 | }
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | // Release FPU if required
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| 82 | hal_disable_irq( &irq_state );
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| 83 | if( core->fpu_owner == this ) core->fpu_owner = NULL;
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| 84 | hal_restore_irq( irq_state );
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| 85 |
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| 86 | // suicide
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| 87 | thread_kill( this );
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| 88 | return 0;
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| 89 |
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| 90 | } // end sys_thread_exit()
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