1 files changed, 118 insertions, 0 deletions
diff --git a/src/core/lib/gpr/sync_windows.cc b/src/core/lib/gpr/sync_windows.cc
new file mode 100644
index 0000000000..7cd41633d5
--- /dev/null
+++ b/src/core/lib/gpr/sync_windows.cc
@@ -0,0 +1,118 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+/* Win32 code for gpr synchronization support. */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_WINDOWS
+
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/time.h>
+
+void gpr_mu_init(gpr_mu* mu) {
+  InitializeCriticalSection(&mu->cs);
+  mu->locked = 0;
+}
+
+void gpr_mu_destroy(gpr_mu* mu) { DeleteCriticalSection(&mu->cs); }
+
+void gpr_mu_lock(gpr_mu* mu) {
+  EnterCriticalSection(&mu->cs);
+  GPR_ASSERT(!mu->locked);
+  mu->locked = 1;
+}
+
+void gpr_mu_unlock(gpr_mu* mu) {
+  mu->locked = 0;
+  LeaveCriticalSection(&mu->cs);
+}
+
+int gpr_mu_trylock(gpr_mu* mu) {
+  int result = TryEnterCriticalSection(&mu->cs);
+  if (result) {
+    if (mu->locked) {                /* This thread already holds the lock. */
+      LeaveCriticalSection(&mu->cs); /* Decrement lock count. */
+      result = 0;                    /* Indicate failure */
+    }
+    mu->locked = 1;
+  }
+  return result;
+}
+
+/*----------------------------------------*/
+
+void gpr_cv_init(gpr_cv* cv) { InitializeConditionVariable(cv); }
+
+void gpr_cv_destroy(gpr_cv* cv) {
+  /* Condition variables don't need destruction in Win32. */
+}
+
+int gpr_cv_wait(gpr_cv* cv, gpr_mu* mu, gpr_timespec abs_deadline) {
+  int timeout = 0;
+  DWORD timeout_max_ms;
+  mu->locked = 0;
+  if (gpr_time_cmp(abs_deadline, gpr_inf_future(abs_deadline.clock_type)) ==
+      0) {
+    SleepConditionVariableCS(cv, &mu->cs, INFINITE);
+  } else {
+    abs_deadline = gpr_convert_clock_type(abs_deadline, GPR_CLOCK_REALTIME);
+    gpr_timespec now = gpr_now(abs_deadline.clock_type);
+    int64_t now_ms = (int64_t)now.tv_sec * 1000 + now.tv_nsec / 1000000;
+    int64_t deadline_ms =
+        (int64_t)abs_deadline.tv_sec * 1000 + abs_deadline.tv_nsec / 1000000;
+    if (now_ms >= deadline_ms) {
+      timeout = 1;
+    } else {
+      if ((deadline_ms - now_ms) >= INFINITE) {
+        timeout_max_ms = INFINITE - 1;
+      } else {
+        timeout_max_ms = (DWORD)(deadline_ms - now_ms);
+      }
+      timeout = (SleepConditionVariableCS(cv, &mu->cs, timeout_max_ms) == 0 &&
+                 GetLastError() == ERROR_TIMEOUT);
+    }
+  }
+  mu->locked = 1;
+  return timeout;
+}
+
+void gpr_cv_signal(gpr_cv* cv) { WakeConditionVariable(cv); }
+
+void gpr_cv_broadcast(gpr_cv* cv) { WakeAllConditionVariable(cv); }
+
+/*----------------------------------------*/
+
+static void* dummy;
+struct run_once_func_arg {
+  void (*init_function)(void);
+};
+static BOOL CALLBACK run_once_func(gpr_once* once, void* v, void** pv) {
+  struct run_once_func_arg* arg = (struct run_once_func_arg*)v;
+  (*arg->init_function)();
+  return 1;
+}
+
+void gpr_once_init(gpr_once* once, void (*init_function)(void)) {
+  struct run_once_func_arg arg;
+  arg.init_function = init_function;
+  InitOnceExecuteOnce(once, run_once_func, &arg, &dummy);
+}
+
+#endif /* GPR_WINDOWS */