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 /* Prototypes for other functions are in thread-posix.h/thread-win32.h.  */
  29 void qemu_rec_mutex_init(QemuRecMutex *mutex);
  30
  31 void qemu_cond_init(QemuCond *cond);
  32 void 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  */
  39 void qemu_cond_signal(QemuCond *cond);
  40 void qemu_cond_broadcast(QemuCond *cond);
  41 void qemu_cond_wait(QemuCond *cond, QemuMutex *mutex);
  42
  43 void qemu_sem_init(QemuSemaphore *sem, int init);
  44 void qemu_sem_post(QemuSemaphore *sem);
  45 void qemu_sem_wait(QemuSemaphore *sem);
  46 int qemu_sem_timedwait(QemuSemaphore *sem, int ms);
  47 void qemu_sem_destroy(QemuSemaphore *sem);
  48
  49 void qemu_event_init(QemuEvent *ev, bool init);
  50 void qemu_event_set(QemuEvent *ev);
  51 void qemu_event_reset(QemuEvent *ev);
  52 void qemu_event_wait(QemuEvent *ev);
  53 void qemu_event_destroy(QemuEvent *ev);
  54
  55 void qemu_thread_create(QemuThread *thread, const char *name,
  56                         void *(*start_routine)(void *),
  57                         void *arg, int mode);
  58 void *qemu_thread_join(QemuThread *thread);
  59 void qemu_thread_get_self(QemuThread *thread);
  60 bool qemu_thread_is_self(QemuThread *thread);
  61 void qemu_thread_exit(void *retval);
  62 void qemu_thread_naming(bool enable);
  63
  64 struct Notifier;
  65 void qemu_thread_atexit_add(struct Notifier *notifier);
  66 void qemu_thread_atexit_remove(struct Notifier *notifier);
  67
  68 typedef struct QemuSpin {
  69     int value;
  70 } QemuSpin;
  71
  72 static inline void qemu_spin_init(QemuSpin *spin)
  73 {
  74     __sync_lock_release(&spin->value);
  75 }
  76
  77 static 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
  86 static inline bool qemu_spin_trylock(QemuSpin *spin)
  87 {
  88     return __sync_lock_test_and_set(&spin->value, true);
  89 }
  90
  91 static inline bool qemu_spin_locked(QemuSpin *spin)
  92 {
  93     return atomic_read(&spin->value);
  94 }
  95
  96 static inline void qemu_spin_unlock(QemuSpin *spin)
  97 {
  98     __sync_lock_release(&spin->value);
  99 }
 100
 101 #endif