ac9a9eba1e
Reviewed-by: Sergey Fedorov <sergey.fedorov@linaro.org> Signed-off-by: Guillaume Delbergue <guillaume.delbergue@greensocs.com> [Rewritten. - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> [Emilio's additions: use TAS instead of atomic_xchg; emit acquire/release barriers; return bool from trylock; call cpu_relax() while spinning; optimize for uncontended locks by acquiring the lock with TAS instead of TATAS; add qemu_spin_locked().] Signed-off-by: Emilio G. Cota <cota@braap.org> Message-Id: <1465412133-3029-6-git-send-email-cota@braap.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
#ifndef __QEMU_THREAD_H
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#define __QEMU_THREAD_H 1
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#include "qemu/processor.h"
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#include "qemu/atomic.h"
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typedef struct QemuMutex QemuMutex;
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typedef struct QemuCond QemuCond;
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typedef struct QemuSemaphore QemuSemaphore;
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typedef struct QemuEvent QemuEvent;
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typedef struct QemuThread QemuThread;
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#ifdef _WIN32
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#include "qemu/thread-win32.h"
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#else
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#include "qemu/thread-posix.h"
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#endif
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#define QEMU_THREAD_JOINABLE 0
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#define QEMU_THREAD_DETACHED 1
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void qemu_mutex_init(QemuMutex *mutex);
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void qemu_mutex_destroy(QemuMutex *mutex);
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void qemu_mutex_lock(QemuMutex *mutex);
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int qemu_mutex_trylock(QemuMutex *mutex);
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void qemu_mutex_unlock(QemuMutex *mutex);
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void qemu_cond_init(QemuCond *cond);
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void qemu_cond_destroy(QemuCond *cond);
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/*
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* IMPORTANT: The implementation does not guarantee that pthread_cond_signal
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* and pthread_cond_broadcast can be called except while the same mutex is
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* held as in the corresponding pthread_cond_wait calls!
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*/
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void qemu_cond_signal(QemuCond *cond);
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void qemu_cond_broadcast(QemuCond *cond);
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void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex);
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void qemu_sem_init(QemuSemaphore *sem, int init);
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void qemu_sem_post(QemuSemaphore *sem);
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void qemu_sem_wait(QemuSemaphore *sem);
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int qemu_sem_timedwait(QemuSemaphore *sem, int ms);
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void qemu_sem_destroy(QemuSemaphore *sem);
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void qemu_event_init(QemuEvent *ev, bool init);
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void qemu_event_set(QemuEvent *ev);
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void qemu_event_reset(QemuEvent *ev);
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void qemu_event_wait(QemuEvent *ev);
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void qemu_event_destroy(QemuEvent *ev);
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void qemu_thread_create(QemuThread *thread, const char *name,
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void *(*start_routine)(void *),
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void *arg, int mode);
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void *qemu_thread_join(QemuThread *thread);
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void qemu_thread_get_self(QemuThread *thread);
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bool qemu_thread_is_self(QemuThread *thread);
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void qemu_thread_exit(void *retval);
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void qemu_thread_naming(bool enable);
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struct Notifier;
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void qemu_thread_atexit_add(struct Notifier *notifier);
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void qemu_thread_atexit_remove(struct Notifier *notifier);
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typedef struct QemuSpin {
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int value;
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} QemuSpin;
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static inline void qemu_spin_init(QemuSpin *spin)
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{
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__sync_lock_release(&spin->value);
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}
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static inline void qemu_spin_lock(QemuSpin *spin)
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{
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while (unlikely(__sync_lock_test_and_set(&spin->value, true))) {
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while (atomic_read(&spin->value)) {
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cpu_relax();
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}
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}
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}
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static inline bool qemu_spin_trylock(QemuSpin *spin)
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{
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return __sync_lock_test_and_set(&spin->value, true);
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}
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static inline bool qemu_spin_locked(QemuSpin *spin)
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{
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return atomic_read(&spin->value);
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}
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static inline void qemu_spin_unlock(QemuSpin *spin)
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{
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__sync_lock_release(&spin->value);
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}
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#endif
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