LXR qemu/include/qemu/thread.h

   1#ifndef QEMU_THREAD_H
   2#define QEMU_THREAD_H
   3
   4#include "qemu/processor.h"
   5#include "qemu/atomic.h"
   6
   7typedef struct QemuMutex QemuMutex;
   8typedef struct QemuCond QemuCond;
   9typedef struct QemuSemaphore QemuSemaphore;
  10typedef struct QemuEvent QemuEvent;
  11typedef struct QemuThread QemuThread;
  12
  13#ifdef _WIN32
  14#include "qemu/thread-win32.h"
  15#else
  16#include "qemu/thread-posix.h"
  17#endif
  18
  19#define QEMU_THREAD_JOINABLE 0
  20#define QEMU_THREAD_DETACHED 1
  21
  22void qemu_mutex_init(QemuMutex *mutex);
  23void qemu_mutex_destroy(QemuMutex *mutex);
  24void qemu_mutex_lock(QemuMutex *mutex);
  25int qemu_mutex_trylock(QemuMutex *mutex);
  26void qemu_mutex_unlock(QemuMutex *mutex);
  27
  28/* Prototypes for other functions are in thread-posix.h/thread-win32.h.  */
  29void qemu_rec_mutex_init(QemuRecMutex *mutex);
  30
  31void qemu_cond_init(QemuCond *cond);
  32void qemu_cond_destroy(QemuCond *cond);
  33
  34/*
  35 * IMPORTANT: The implementation does not guarantee that pthread_cond_signal
  36 * and pthread_cond_broadcast can be called except while the same mutex is
  37 * held as in the corresponding pthread_cond_wait calls!
  38 */
  39void qemu_cond_signal(QemuCond *cond);
  40void qemu_cond_broadcast(QemuCond *cond);
  41void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex);
  42
  43void qemu_sem_init(QemuSemaphore *sem, int init);
  44void qemu_sem_post(QemuSemaphore *sem);
  45void qemu_sem_wait(QemuSemaphore *sem);
  46int qemu_sem_timedwait(QemuSemaphore *sem, int ms);
  47void qemu_sem_destroy(QemuSemaphore *sem);
  48
  49void qemu_event_init(QemuEvent *ev, bool init);
  50void qemu_event_set(QemuEvent *ev);
  51void qemu_event_reset(QemuEvent *ev);
  52void qemu_event_wait(QemuEvent *ev);
  53void qemu_event_destroy(QemuEvent *ev);
  54
  55void qemu_thread_create(QemuThread *thread, const char *name,
  56                        void *(*start_routine)(void *),
  57                        void *arg, int mode);
  58void *qemu_thread_join(QemuThread *thread);
  59void qemu_thread_get_self(QemuThread *thread);
  60bool qemu_thread_is_self(QemuThread *thread);
  61void qemu_thread_exit(void *retval);
  62void qemu_thread_naming(bool enable);
  63
  64struct Notifier;
  65void qemu_thread_atexit_add(struct Notifier *notifier);
  66void qemu_thread_atexit_remove(struct Notifier *notifier);
  67
  68typedef struct QemuSpin {
  69    int value;
  70} QemuSpin;
  71
  72static inline void qemu_spin_init(QemuSpin *spin)
  73{
  74    __sync_lock_release(&spin->value);
  75}
  76
  77static inline void qemu_spin_lock(QemuSpin *spin)
  78{
  79    while (unlikely(__sync_lock_test_and_set(&spin->value, true))) {
  80        while (atomic_read(&spin->value)) {
  81            cpu_relax();
  82        }
  83    }
  84}
  85
  86static inline bool qemu_spin_trylock(QemuSpin *spin)
  87{
  88    return __sync_lock_test_and_set(&spin->value, true);
  89}
  90
  91static inline bool qemu_spin_locked(QemuSpin *spin)
  92{
  93    return atomic_read(&spin->value);
  94}
  95
  96static inline void qemu_spin_unlock(QemuSpin *spin)
  97{
  98    __sync_lock_release(&spin->value);
  99}
 100
 101#endif
 102