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/* |
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* timer_unix.cpp - Time Manager emulation, Unix specific stuff |
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* |
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< |
* Basilisk II (C) 1997-2001 Christian Bauer |
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* Basilisk II (C) 1997-2005 Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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// Linux select() changes its timeout parameter upon return to contain |
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// the remaining time. Most other unixen leave it unchanged or undefined. |
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#define SELECT_SETS_REMAINING |
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#elif defined(__FreeBSD__) || defined(__sun__) |
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> |
#elif defined(__FreeBSD__) || defined(__sun__) || (defined(__MACH__) && defined(__APPLE__)) |
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#define USE_NANOSLEEP |
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#elif defined(HAVE_PTHREADS) && defined(sgi) |
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// SGI pthreads has a bug when using pthreads+signals+nanosleep, |
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#endif |
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} while (was_error && (errno == EINTR)); |
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} |
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|
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/* |
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* Suspend emulator thread, virtual CPU in idle mode |
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*/ |
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|
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#ifdef HAVE_PTHREADS |
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#if defined(HAVE_PTHREAD_COND_INIT) |
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#define IDLE_USES_COND_WAIT 1 |
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static pthread_mutex_t idle_lock = PTHREAD_MUTEX_INITIALIZER; |
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static pthread_cond_t idle_cond = PTHREAD_COND_INITIALIZER; |
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#elif defined(HAVE_SEM_INIT) |
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#define IDLE_USES_SEMAPHORE 1 |
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#include <semaphore.h> |
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#ifdef HAVE_SPINLOCKS |
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static spinlock_t idle_lock = SPIN_LOCK_UNLOCKED; |
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#define LOCK_IDLE spin_lock(&idle_lock) |
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#define UNLOCK_IDLE spin_unlock(&idle_lock) |
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#else |
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static pthread_mutex_t idle_lock = PTHREAD_MUTEX_INITIALIZER; |
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#define LOCK_IDLE pthread_mutex_lock(&idle_lock) |
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#define UNLOCK_IDLE pthread_mutex_unlock(&idle_lock) |
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#endif |
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static sem_t idle_sem; |
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static int idle_sem_ok = -1; |
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#endif |
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#endif |
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|
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void idle_wait(void) |
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{ |
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#ifdef IDLE_USES_COND_WAIT |
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pthread_mutex_lock(&idle_lock); |
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pthread_cond_wait(&idle_cond, &idle_lock); |
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pthread_mutex_unlock(&idle_lock); |
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#else |
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#ifdef IDLE_USES_SEMAPHORE |
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LOCK_IDLE; |
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if (idle_sem_ok < 0) |
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idle_sem_ok = (sem_init(&idle_sem, 0, 0) == 0); |
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if (idle_sem_ok > 0) { |
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idle_sem_ok++; |
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UNLOCK_IDLE; |
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sem_wait(&idle_sem); |
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return; |
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} |
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UNLOCK_IDLE; |
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#endif |
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|
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// Fallback: sleep 10 ms |
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Delay_usec(10000); |
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#endif |
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} |
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|
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|
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/* |
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* Resume execution of emulator thread, events just arrived |
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*/ |
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|
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void idle_resume(void) |
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{ |
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#ifdef IDLE_USES_COND_WAIT |
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pthread_cond_signal(&idle_cond); |
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#else |
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#ifdef IDLE_USES_SEMAPHORE |
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LOCK_IDLE; |
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if (idle_sem_ok > 1) { |
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idle_sem_ok--; |
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UNLOCK_IDLE; |
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sem_post(&idle_sem); |
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return; |
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} |
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UNLOCK_IDLE; |
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#endif |
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#endif |
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} |
