1 files changed, 33 insertions, 0 deletions
diff --git a/src/os/win32/ngx_atomic.h b/src/os/win32/ngx_atomic.h
new file mode 100644
index 000000000..fcc3ff1ee
--- /dev/null
+++ b/src/os/win32/ngx_atomic.h
@@ -0,0 +1,33 @@
+#ifndef _NGX_ATOMIC_H_INCLUDED_
+#define _NGX_ATOMIC_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#define ngx_atomic_inc(p)       InterlockedIncrement((long *) p)
+#define ngx_atomic_dec(p)       InterlockedDecrement((long *) p)
+
+
+#if defined( __WATCOMC__ ) || defined( __BORLANDC__ )
+
+#define ngx_atomic_cmp_set(lock, old, set)                                    \
+     (InterlockedCompareExchange((long *) lock, set, old) == old)
+
+#else
+
+#define ngx_atomic_cmp_set(lock, old, set)                                    \
+     (InterlockedCompareExchange((void **) lock, (void *) set, (void *) old)  \
+      == (void *) old)
+
+#endif
+
+
+void ngx_spinlock(ngx_atomic_t *lock, ngx_uint_t spin);
+
+#define ngx_trylock(lock)  (*(lock) == 0 && ngx_atomic_cmp_set(lock, 0, 1))
+#define ngx_unlock(lock)    *(lock) = 0
+
+
+#endif /* _NGX_ATOMIC_H_INCLUDED_ */