#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/internal.h"
#include "libavutil/mem.h"
* not mutexes */
typedef CRITICAL_SECTION pthread_mutex_t;
-/* This is the CONDITIONAL_VARIABLE typedef for using Window's native
- * conditional variables on kernels 6.0+.
- * MinGW does not currently have this typedef. */
+/* This is the CONDITION_VARIABLE typedef for using Windows' native
+ * conditional variables on kernels 6.0+. */
+#if HAVE_CONDITION_VARIABLE_PTR
+typedef CONDITION_VARIABLE pthread_cond_t;
+#else
typedef struct pthread_cond_t {
- void *ptr;
+ void *Ptr;
} pthread_cond_t;
+#endif
-/* function pointers to conditional variable API on windows 6.0+ kernels */
-#if _WIN32_WINNT < 0x0600
-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);
-#else
-#define cond_init InitializeConditionVariable
-#define cond_broadcast WakeAllConditionVariable
-#define cond_signal WakeConditionVariable
-#define cond_wait SleepConditionVariableCS
-
-#define CreateEvent(a, reset, init, name) \
- CreateEventEx(a, name, \
- (reset ? CREATE_EVENT_MANUAL_RESET : 0) | \
- (init ? CREATE_EVENT_INITIAL_SET : 0), \
- EVENT_ALL_ACCESS)
-// CreateSemaphoreExA seems to be desktop-only, but as long as we don't
-// use named semaphores, it doesn't matter if we use the W version.
-#define CreateSemaphore(a, b, c, d) \
- CreateSemaphoreExW(a, b, c, d, 0, SEMAPHORE_ALL_ACCESS)
+#if _WIN32_WINNT >= 0x0600
#define InitializeCriticalSection(x) InitializeCriticalSectionEx(x, 0, 0)
#define WaitForSingleObject(a, b) WaitForSingleObjectEx(a, b, FALSE)
#endif
return 0;
}
+#if _WIN32_WINNT >= 0x0600
+
+typedef INIT_ONCE pthread_once_t;
+#define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT
+
+static av_unused int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))
+{
+ BOOL pending = FALSE;
+ InitOnceBeginInitialize(once_control, 0, &pending, NULL);
+ if (pending)
+ init_routine();
+ InitOnceComplete(once_control, 0, NULL);
+ return 0;
+}
+
+static inline void pthread_cond_init(pthread_cond_t *cond, const void *unused_attr)
+{
+ InitializeConditionVariable(cond);
+}
+
+/* native condition variables do not destroy */
+static inline void pthread_cond_destroy(pthread_cond_t *cond)
+{
+ return;
+}
+
+static inline void pthread_cond_broadcast(pthread_cond_t *cond)
+{
+ WakeAllConditionVariable(cond);
+}
+
+static inline int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
+{
+ SleepConditionVariableCS(cond, mutex, INFINITE);
+ return 0;
+}
+
+static inline void pthread_cond_signal(pthread_cond_t *cond)
+{
+ WakeConditionVariable(cond);
+}
+
+#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 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 void 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;
win32_cond = av_mallocz(sizeof(win32_cond_t));
if (!win32_cond)
return;
- cond->ptr = win32_cond;
+ cond->Ptr = win32_cond;
win32_cond->semaphore = CreateSemaphore(NULL, 0, 0x7fffffff, NULL);
if (!win32_cond->semaphore)
return;
static av_unused void pthread_cond_destroy(pthread_cond_t *cond)
{
- win32_cond_t *win32_cond = cond->ptr;
+ win32_cond_t *win32_cond = cond->Ptr;
/* native condition variables do not destroy */
if (cond_init)
return;
pthread_mutex_destroy(&win32_cond->mtx_waiter_count);
pthread_mutex_destroy(&win32_cond->mtx_broadcast);
av_freep(&win32_cond);
- cond->ptr = NULL;
+ cond->Ptr = NULL;
}
static av_unused void pthread_cond_broadcast(pthread_cond_t *cond)
{
- win32_cond_t *win32_cond = cond->ptr;
+ win32_cond_t *win32_cond = cond->Ptr;
int have_waiter;
if (cond_broadcast) {
static av_unused int pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
- win32_cond_t *win32_cond = cond->ptr;
+ win32_cond_t *win32_cond = cond->Ptr;
int last_waiter;
if (cond_wait) {
cond_wait(cond, mutex, INFINITE);
static av_unused void pthread_cond_signal(pthread_cond_t *cond)
{
- win32_cond_t *win32_cond = cond->ptr;
+ win32_cond_t *win32_cond = cond->Ptr;
int have_waiter;
if (cond_signal) {
cond_signal(cond);
pthread_mutex_unlock(&win32_cond->mtx_broadcast);
}
+#endif
static av_unused void w32thread_init(void)
{
#if _WIN32_WINNT < 0x0600
HANDLE kernel_dll = GetModuleHandle(TEXT("kernel32.dll"));
/* if one is available, then they should all be available */
- cond_init =
- (void*)GetProcAddress(kernel_dll, "InitializeConditionVariable");
- cond_broadcast =
- (void*)GetProcAddress(kernel_dll, "WakeAllConditionVariable");
- cond_signal =
- (void*)GetProcAddress(kernel_dll, "WakeConditionVariable");
- cond_wait =
- (void*)GetProcAddress(kernel_dll, "SleepConditionVariableCS");
+ 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
}
projects / ffmpeg / blobdiff