1 files changed, 74 insertions, 0 deletions
diff --git a/vendor/zgui/libs/winpthreads/src/spinlock.c b/vendor/zgui/libs/winpthreads/src/spinlock.c
new file mode 100644
index 0000000..224c5a0
--- /dev/null
+++ b/vendor/zgui/libs/winpthreads/src/spinlock.c
@@ -0,0 +1,74 @@
+/*
+   Copyright (c) 2013 mingw-w64 project
+   Copyright (c) 2015 Intel Corporation
+
+   Permission is hereby granted, free of charge, to any person obtaining a
+   copy of this software and associated documentation files (the "Software"),
+   to deal in the Software without restriction, including without limitation
+   the rights to use, copy, modify, merge, publish, distribute, sublicense,
+   and/or sell copies of the Software, and to permit persons to whom the
+   Software is furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be included in
+   all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+*/
+
+#include <windows.h>
+#include "pthread.h"
+#include "misc.h"
+
+/* We use the pthread_spinlock_t itself as a lock:
+   -1 is free, 0 is locked.
+   (This is dictated by PTHREAD_SPINLOCK_INITIALIZER, which we can't change
+   without breaking binary compatibility.) */
+typedef intptr_t spinlock_word_t;
+
+int
+pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  spinlock_word_t *lk = (spinlock_word_t *)lock;
+  *lk = -1;
+  return 0;
+}
+
+
+int
+pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  return 0;
+}
+
+int
+pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  volatile spinlock_word_t *lk = (volatile spinlock_word_t *)lock;
+  while (unlikely(InterlockedExchangePointer((PVOID volatile *)lk, 0) == 0))
+    do {
+      YieldProcessor();
+    } while (*lk == 0);
+  return 0;
+}
+  
+int
+pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  spinlock_word_t *lk = (spinlock_word_t *)lock;
+  return InterlockedExchangePointer((PVOID volatile *)lk, 0) == 0 ? EBUSY : 0;
+}
+
+
+int
+pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  volatile spinlock_word_t *lk = (volatile spinlock_word_t *)lock;
+  *lk = -1;
+  return 0;
+}