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Change the Linux Port to use condition variables instead of Signals (#156)
* Posix port with pthread cond instead of signals * Comment: replace signal with pthread_cond Co-authored-by: Alfred Gedeon <gedeonag@amazon.com>
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3 changed files with 126 additions and 95 deletions
76
portable/ThirdParty/GCC/Posix/utils/wait_for_event.c
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portable/ThirdParty/GCC/Posix/utils/wait_for_event.c
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#include <pthread.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "wait_for_event.h"
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struct event
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{
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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bool event_triggered;
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};
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struct event * event_create()
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{
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struct event * ev = malloc( sizeof( struct event ) );
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ev->event_triggered = false;
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pthread_mutex_init( &ev->mutex, NULL );
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pthread_cond_init( &ev->cond, NULL );
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return ev;
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}
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void event_delete( struct event * ev )
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{
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pthread_mutex_destroy( &ev->mutex );
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pthread_cond_destroy( &ev->cond );
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free( ev );
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}
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bool event_wait( struct event * ev )
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{
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pthread_mutex_lock( &ev->mutex );
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while( ev->event_triggered == false )
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{
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pthread_cond_wait( &ev->cond, &ev->mutex );
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}
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ev->event_triggered = false;
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pthread_mutex_unlock( &ev->mutex );
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return true;
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}
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bool event_wait_timed( struct event * ev,
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time_t ms )
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{
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struct timespec ts;
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int ret = 0;
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clock_gettime( CLOCK_REALTIME, &ts );
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//ts.tv_sec += ms;
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ts.tv_nsec += (ms * 1000000);
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pthread_mutex_lock( &ev->mutex );
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while( (ev->event_triggered == false) && (ret == 0) )
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{
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ret = pthread_cond_timedwait( &ev->cond, &ev->mutex, &ts );
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if( ( ret == -1 ) && ( errno == ETIMEDOUT ) )
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{
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return false;
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}
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}
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ev->event_triggered = false;
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pthread_mutex_unlock( &ev->mutex );
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return true;
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}
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void event_signal( struct event * ev )
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{
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pthread_mutex_lock( &ev->mutex );
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ev->event_triggered = true;
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pthread_cond_signal( &ev->cond );
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pthread_mutex_unlock( &ev->mutex );
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}
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18
portable/ThirdParty/GCC/Posix/utils/wait_for_event.h
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portable/ThirdParty/GCC/Posix/utils/wait_for_event.h
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#ifndef _WAIT_FOR_EVENT_H_
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#define _WAIT_FOR_EVENT_H_
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#include <stdbool.h>
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#include <time.h>
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struct event;
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struct event * event_create();
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void event_delete( struct event * );
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bool event_wait( struct event * ev );
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bool event_wait_timed( struct event * ev,
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time_t ms );
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void event_signal( struct event * ev );
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#endif /* ifndef _WAIT_FOR_EVENT_H_ */
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