1 files changed, 113 insertions, 0 deletions
diff --git a/third_party/rust/glslopt/glsl-optimizer/src/util/futex.h b/third_party/rust/glslopt/glsl-optimizer/src/util/futex.h
new file mode 100644
index 0000000000..4d712e2ef2
--- /dev/null
+++ b/third_party/rust/glslopt/glsl-optimizer/src/util/futex.h
@@ -0,0 +1,113 @@
+/*
+ * Copyright © 2015 Intel
+ *
+ * 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 (including the next
+ * paragraph) 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.
+ */
+
+#ifndef UTIL_FUTEX_H
+#define UTIL_FUTEX_H
+
+#if defined(HAVE_LINUX_FUTEX_H)
+#define UTIL_FUTEX_SUPPORTED 1
+
+#include <limits.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <linux/futex.h>
+#include <sys/syscall.h>
+#include <sys/time.h>
+
+static inline long sys_futex(void *addr1, int op, int val1, const struct timespec *timeout, void *addr2, int val3)
+{
+   return syscall(SYS_futex, addr1, op, val1, timeout, addr2, val3);
+}
+
+static inline int futex_wake(uint32_t *addr, int count)
+{
+   return sys_futex(addr, FUTEX_WAKE, count, NULL, NULL, 0);
+}
+
+static inline int futex_wait(uint32_t *addr, int32_t value, const struct timespec *timeout)
+{
+   /* FUTEX_WAIT_BITSET with FUTEX_BITSET_MATCH_ANY is equivalent to
+    * FUTEX_WAIT, except that it treats the timeout as absolute. */
+   return sys_futex(addr, FUTEX_WAIT_BITSET, value, timeout, NULL,
+                    FUTEX_BITSET_MATCH_ANY);
+}
+
+#elif defined(__FreeBSD__)
+#define UTIL_FUTEX_SUPPORTED 1
+
+#include <assert.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/umtx.h>
+#include <sys/time.h>
+
+static inline int futex_wake(uint32_t *addr, int count)
+{
+   assert(count == (int)(uint32_t)count); /* Check that bits weren't discarded */
+   return _umtx_op(addr, UMTX_OP_WAKE, (uint32_t)count, NULL, NULL) == -1 ? errno : 0;
+}
+
+static inline int futex_wait(uint32_t *addr, int32_t value, struct timespec *timeout)
+{
+   void *uaddr = NULL, *uaddr2 = NULL;
+   struct _umtx_time tmo = {
+      ._flags = UMTX_ABSTIME,
+      ._clockid = CLOCK_MONOTONIC
+   };
+
+   assert(value == (int)(uint32_t)value); /* Check that bits weren't discarded */
+
+   if (timeout != NULL) {
+      tmo._timeout = *timeout;
+      uaddr = (void *)(uintptr_t)sizeof(tmo);
+      uaddr2 = (void *)&tmo;
+   }
+
+   return _umtx_op(addr, UMTX_OP_WAIT_UINT, (uint32_t)value, uaddr, uaddr2) == -1 ? errno : 0;
+}
+
+#elif defined(__OpenBSD__)
+#define UTIL_FUTEX_SUPPORTED 1
+
+#include <sys/time.h>
+#include <sys/futex.h>
+
+static inline int futex_wake(uint32_t *addr, int count)
+{
+   return futex(addr, FUTEX_WAKE, count, NULL, NULL);
+}
+
+static inline int futex_wait(uint32_t *addr, int32_t value, const struct timespec *timeout)
+{
+   struct timespec tsrel, tsnow;
+   clock_gettime(CLOCK_MONOTONIC, &tsnow); 
+   timespecsub(timeout, &tsrel, &tsrel);
+   return futex(addr, FUTEX_WAIT, value, &tsrel, NULL);
+}
+
+#else
+#define UTIL_FUTEX_SUPPORTED 0
+#endif
+
+#endif /* UTIL_FUTEX_H */