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win32: Add implementation of pthread_once

This function will be required to make dav1d_init threadsafe.

Full erro checking support is included in this implementation,
for completeness, even though dav1d_init cannot fail, and thus
will ignore the return value of pthread_once.

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

--- a/src/thread.h

+++ b/src/thread.h

@@ -32,8 +32,11 @@

 #include <windows.h>

+#define PTHREAD_ONCE_INIT INIT_ONCE_STATIC_INIT

+

 typedef CRITICAL_SECTION pthread_mutex_t;

 typedef CONDITION_VARIABLE pthread_cond_t;

+typedef INIT_ONCE pthread_once_t;

 typedef void *pthread_t;

 typedef void *pthread_mutexattr_t;

 typedef void *pthread_condattr_t;

@@ -53,6 +56,8 @@

 int pthread_create(pthread_t* thread, const pthread_attr_t* attr,

                    void*(*proc)(void*), void* param);

 void pthread_join(pthread_t thread, void** res);

+

+int pthread_once(pthread_once_t *once_control, void (*init_routine)(void));

 #else

--- a/src/win32/thread.c

+++ b/src/win32/thread.c

@@ -125,4 +125,23 @@

     free(th);

 }

+int pthread_once(pthread_once_t *once_control, void (*init_routine)(void))

+{

+    BOOL fPending = FALSE;

+    BOOL fStatus;

+

+    fStatus = InitOnceBeginInitialize(once_control, 0, &fPending, NULL);

+    if (fStatus != TRUE)

+        return EINVAL;

+

+    if (fPending == TRUE)

+        init_routine();

+

+    fStatus = InitOnceComplete(once_control, 0, NULL);

+    if (!fStatus)

+        return EINVAL;

+

+    return 0;

+}

+

 #endif