#include <windows.h>
#include <process.h>
-#if _WIN32_WINNT < 0x0600 && defined(__MINGW32__)
-#undef MemoryBarrier
-#define MemoryBarrier __sync_synchronize
-#endif
-
#include "libavutil/attributes.h"
#include "libavutil/common.h"
#include "libavutil/internal.h"
void *ret;
} pthread_t;
-/* the conditional variable api for windows 6.0+ uses critical sections and
- * not mutexes */
-typedef CRITICAL_SECTION pthread_mutex_t;
-
-/* This is the CONDITION_VARIABLE typedef for using Windows' native
- * conditional variables on kernels 6.0+. */
-#if HAVE_CONDITION_VARIABLE_PTR
+/* use light weight mutex/condition variable API for Windows Vista and later */
+typedef SRWLOCK pthread_mutex_t;
typedef CONDITION_VARIABLE pthread_cond_t;
-#else
-typedef struct pthread_cond_t {
- void *Ptr;
-} pthread_cond_t;
-#endif
-#if _WIN32_WINNT >= 0x0600
+#define PTHREAD_MUTEX_INITIALIZER SRWLOCK_INIT
+#define PTHREAD_COND_INITIALIZER CONDITION_VARIABLE_INIT
+
#define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
#define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)
-#endif
static av_unused unsigned __stdcall attribute_align_arg win32thread_worker(void *arg)
{
static inline int pthread_mutex_init(pthread_mutex_t *m, void* attr)
{
- InitializeCriticalSection(m);
+ InitializeSRWLock(m);
return 0;
}
static inline int pthread_mutex_destroy(pthread_mutex_t *m)
{
- DeleteCriticalSection(m);
+ /* Unlocked SWR locks use no resources */
return 0;
}
static inline int pthread_mutex_lock(pthread_mutex_t *m)
{
- EnterCriticalSection(m);
+ AcquireSRWLockExclusive(m);
return 0;
}
static inline int pthread_mutex_unlock(pthread_mutex_t *m)
{
- LeaveCriticalSection(m);
+ ReleaseSRWLockExclusive(m);
return 0;
}
-#if _WIN32_WINNT >= 0x0600
typedef INIT_ONCE pthread_once_t;
#define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
- SleepConditionVariableCS(cond, mutex, INFINITE);
+ SleepConditionVariableSRW(cond, mutex, INFINITE, 0);
return 0;
}
return 0;
}
-#else // _WIN32_WINNT < 0x0600
-
-/* atomic init state of dynamically loaded functions */
-static LONG w32thread_init_state = 0;
-static av_unused void w32thread_init(void);
-
-/* for pre-Windows 6.0 platforms, define INIT_ONCE struct,
- * compatible to the one used in the native API */
-
-typedef union pthread_once_t {
- void * Ptr; ///< For the Windows 6.0+ native functions
- LONG state; ///< For the pre-Windows 6.0 compat code
-} pthread_once_t;
-
-#define PTHREAD_ONCE_INIT {0}
-
-/* function pointers to init once API on windows 6.0+ kernels */
-static BOOL (WINAPI *initonce_begin)(pthread_once_t *lpInitOnce, DWORD dwFlags, BOOL *fPending, void **lpContext);
-static BOOL (WINAPI *initonce_complete)(pthread_once_t *lpInitOnce, DWORD dwFlags, void *lpContext);
-
-/* pre-Windows 6.0 compat using a spin-lock */
-static inline void w32thread_once_fallback(LONG volatile *state, void (*init_routine)(void))
-{
- switch (InterlockedCompareExchange(state, 1, 0)) {
- /* Initial run */
- case 0:
- init_routine();
- InterlockedExchange(state, 2);
- break;
- /* Another thread is running init */
- case 1:
- while (1) {
- MemoryBarrier();
- if (*state == 2)
- break;
- Sleep(0);
- }
- break;
- /* Initialization complete */
- case 2:
- break;
- }
-}
-
-static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
-{
- w32thread_once_fallback(&w32thread_init_state, w32thread_init);
-
- /* Use native functions on Windows 6.0+ */
- if (initonce_begin && initonce_complete) {
- BOOL pending = FALSE;
- initonce_begin(once_control, 0, &pending, NULL);
- if (pending)
- init_routine();
- initonce_complete(once_control, 0, NULL);
- return 0;
- }
-
- w32thread_once_fallback(&once_control->state, init_routine);
- return 0;
-}
-
-/* for pre-Windows 6.0 platforms we need to define and use our own condition
- * variable and api */
-
-typedef struct win32_cond_t {
- pthread_mutex_t mtx_broadcast;
- pthread_mutex_t mtx_waiter_count;
- volatile int waiter_count;
- HANDLE semaphore;
- HANDLE waiters_done;
- volatile int is_broadcast;
-} win32_cond_t;
-
-/* function pointers to conditional variable API on windows 6.0+ kernels */
-static void (WINAPI *cond_broadcast)(pthread_cond_t *cond);
-static void (WINAPI *cond_init)(pthread_cond_t *cond);
-static void (WINAPI *cond_signal)(pthread_cond_t *cond);
-static BOOL (WINAPI *cond_wait)(pthread_cond_t *cond, pthread_mutex_t *mutex,
- DWORD milliseconds);
-
-static av_unused int pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
-{
- win32_cond_t *win32_cond = NULL;
-
- w32thread_once_fallback(&w32thread_init_state, w32thread_init);
-
- if (cond_init) {
- cond_init(cond);
- return 0;
- }
-
- /* non native condition variables */
- win32_cond = (win32_cond_t*)av_mallocz(sizeof(win32_cond_t));
- if (!win32_cond)
- return ENOMEM;
- cond->Ptr = win32_cond;
- win32_cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL);
- if (!win32_cond->semaphore)
- return ENOMEM;
- win32_cond->waiters_done = CreateEvent(NULL, TRUE, FALSE, NULL);
- if (!win32_cond->waiters_done)
- return ENOMEM;
-
- pthread_mutex_init(&win32_cond->mtx_waiter_count, NULL);
- pthread_mutex_init(&win32_cond->mtx_broadcast, NULL);
- return 0;
-}
-
-static av_unused int pthread_cond_destroy(pthread_cond_t *cond)
-{
- win32_cond_t *win32_cond = (win32_cond_t*)cond->Ptr;
- /* native condition variables do not destroy */
- if (cond_init)
- return 0;
-
- /* non native condition variables */
- CloseHandle(win32_cond->semaphore);
- CloseHandle(win32_cond->waiters_done);
- pthread_mutex_destroy(&win32_cond->mtx_waiter_count);
- pthread_mutex_destroy(&win32_cond->mtx_broadcast);
- av_freep(&win32_cond);
- cond->Ptr = NULL;
- return 0;
-}
-
-static av_unused int pthread_cond_broadcast(pthread_cond_t *cond)
-{
- win32_cond_t *win32_cond = (win32_cond_t*)cond->Ptr;
- int have_waiter;
-
- if (cond_broadcast) {
- cond_broadcast(cond);
- return 0;
- }
-
- /* non native condition variables */
- pthread_mutex_lock(&win32_cond->mtx_broadcast);
- pthread_mutex_lock(&win32_cond->mtx_waiter_count);
- have_waiter = 0;
-
- if (win32_cond->waiter_count) {
- win32_cond->is_broadcast = 1;
- have_waiter = 1;
- }
-
- if (have_waiter) {
- ReleaseSemaphore(win32_cond->semaphore, win32_cond->waiter_count, NULL);
- pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
- WaitForSingleObject(win32_cond->waiters_done, INFINITE);
- ResetEvent(win32_cond->waiters_done);
- win32_cond->is_broadcast = 0;
- } else
- pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
- pthread_mutex_unlock(&win32_cond->mtx_broadcast);
- return 0;
-}
-
-static av_unused int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
-{
- win32_cond_t *win32_cond = (win32_cond_t*)cond->Ptr;
- int last_waiter;
- if (cond_wait) {
- cond_wait(cond, mutex, INFINITE);
- return 0;
- }
-
- /* non native condition variables */
- pthread_mutex_lock(&win32_cond->mtx_broadcast);
- pthread_mutex_lock(&win32_cond->mtx_waiter_count);
- win32_cond->waiter_count++;
- pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
- pthread_mutex_unlock(&win32_cond->mtx_broadcast);
-
- // unlock the external mutex
- pthread_mutex_unlock(mutex);
- WaitForSingleObject(win32_cond->semaphore, INFINITE);
-
- pthread_mutex_lock(&win32_cond->mtx_waiter_count);
- win32_cond->waiter_count--;
- last_waiter = !win32_cond->waiter_count || !win32_cond->is_broadcast;
- pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
-
- if (last_waiter)
- SetEvent(win32_cond->waiters_done);
-
- // lock the external mutex
- return pthread_mutex_lock(mutex);
-}
-
-static av_unused int pthread_cond_signal(pthread_cond_t *cond)
-{
- win32_cond_t *win32_cond = (win32_cond_t*)cond->Ptr;
- int have_waiter;
- if (cond_signal) {
- cond_signal(cond);
- return 0;
- }
-
- pthread_mutex_lock(&win32_cond->mtx_broadcast);
-
- /* non-native condition variables */
- pthread_mutex_lock(&win32_cond->mtx_waiter_count);
- have_waiter = win32_cond->waiter_count;
- pthread_mutex_unlock(&win32_cond->mtx_waiter_count);
-
- if (have_waiter) {
- ReleaseSemaphore(win32_cond->semaphore, 1, NULL);
- WaitForSingleObject(win32_cond->waiters_done, INFINITE);
- ResetEvent(win32_cond->waiters_done);
- }
-
- pthread_mutex_unlock(&win32_cond->mtx_broadcast);
- return 0;
-}
-#endif
-
-static av_unused void w32thread_init(void)
-{
-#if _WIN32_WINNT < 0x0600
- HMODULE kernel_dll = GetModuleHandle(TEXT("kernel32.dll"));
- /* if one is available, then they should all be available */
- cond_init = (void (WINAPI*)(pthread_cond_t *))
- GetProcAddress(kernel_dll, "InitializeConditionVariable");
- cond_broadcast = (void (WINAPI*)(pthread_cond_t *))
- GetProcAddress(kernel_dll, "WakeAllConditionVariable");
- cond_signal = (void (WINAPI*)(pthread_cond_t *))
- GetProcAddress(kernel_dll, "WakeConditionVariable");
- cond_wait = (BOOL (WINAPI*)(pthread_cond_t *, pthread_mutex_t *, DWORD))
- GetProcAddress(kernel_dll, "SleepConditionVariableCS");
- initonce_begin = (BOOL (WINAPI*)(pthread_once_t *, DWORD, BOOL *, void **))
- GetProcAddress(kernel_dll, "InitOnceBeginInitialize");
- initonce_complete = (BOOL (WINAPI*)(pthread_once_t *, DWORD, void *))
- GetProcAddress(kernel_dll, "InitOnceComplete");
-#endif
-
-}
-
#endif /* COMPAT_W32PTHREADS_H */
projects / ffmpeg / blobdiff