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