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-rw-r--r--compat/win32/pthread.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/compat/win32/pthread.c b/compat/win32/pthread.c
new file mode 100644
index 000000000..631c0a46e
--- /dev/null
+++ b/compat/win32/pthread.c
@@ -0,0 +1,110 @@
+/*
+ * Copyright (C) 2009 Andrzej K. Haczewski <ahaczewski@gmail.com>
+ *
+ * DISCLAMER: The implementation is Git-specific, it is subset of original
+ * Pthreads API, without lots of other features that Git doesn't use.
+ * Git also makes sure that the passed arguments are valid, so there's
+ * no need for double-checking.
+ */
+
+#include "../../git-compat-util.h"
+#include "pthread.h"
+
+#include <errno.h>
+#include <limits.h>
+
+static unsigned __stdcall win32_start_routine(void *arg)
+{
+ pthread_t *thread = arg;
+ thread->arg = thread->start_routine(thread->arg);
+ return 0;
+}
+
+int pthread_create(pthread_t *thread, const void *unused,
+ void *(*start_routine)(void*), void *arg)
+{
+ thread->arg = arg;
+ thread->start_routine = start_routine;
+ thread->handle = (HANDLE)
+ _beginthreadex(NULL, 0, win32_start_routine, thread, 0, NULL);
+
+ if (!thread->handle)
+ return errno;
+ else
+ return 0;
+}
+
+int win32_pthread_join(pthread_t *thread, void **value_ptr)
+{
+ DWORD result = WaitForSingleObject(thread->handle, INFINITE);
+ switch (result) {
+ case WAIT_OBJECT_0:
+ if (value_ptr)
+ *value_ptr = thread->arg;
+ return 0;
+ case WAIT_ABANDONED:
+ return EINVAL;
+ default:
+ return err_win_to_posix(GetLastError());
+ }
+}
+
+int pthread_cond_init(pthread_cond_t *cond, const void *unused)
+{
+ cond->waiters = 0;
+
+ cond->sema = CreateSemaphore(NULL, 0, LONG_MAX, NULL);
+ if (!cond->sema)
+ die("CreateSemaphore() failed");
+ return 0;
+}
+
+int pthread_cond_destroy(pthread_cond_t *cond)
+{
+ CloseHandle(cond->sema);
+ cond->sema = NULL;
+
+ return 0;
+}
+
+int pthread_cond_wait(pthread_cond_t *cond, CRITICAL_SECTION *mutex)
+{
+ InterlockedIncrement(&cond->waiters);
+
+ /*
+ * Unlock external mutex and wait for signal.
+ * NOTE: we've held mutex locked long enough to increment
+ * waiters count above, so there's no problem with
+ * leaving mutex unlocked before we wait on semaphore.
+ */
+ LeaveCriticalSection(mutex);
+
+ /* let's wait - ignore return value */
+ WaitForSingleObject(cond->sema, INFINITE);
+
+ /* we're done waiting, so make sure we decrease waiters count */
+ InterlockedDecrement(&cond->waiters);
+
+ /* lock external mutex again */
+ EnterCriticalSection(mutex);
+
+ return 0;
+}
+
+int pthread_cond_signal(pthread_cond_t *cond)
+{
+ /*
+ * Access to waiters count is atomic; see "Interlocked Variable Access"
+ * http://msdn.microsoft.com/en-us/library/ms684122(VS.85).aspx
+ */
+ int have_waiters = cond->waiters > 0;
+
+ /*
+ * Signal only when there are waiters
+ */
+ if (have_waiters)
+ return ReleaseSemaphore(cond->sema, 1, NULL) ?
+ 0 : err_win_to_posix(GetLastError());
+ else
+ return 0;
+}