1 files changed, 152 insertions, 0 deletions
diff --git a/src/core/lib/gpr/thd_posix.cc b/src/core/lib/gpr/thd_posix.cc
new file mode 100644
index 0000000000..cfff0df6de
--- /dev/null
+++ b/src/core/lib/gpr/thd_posix.cc
@@ -0,0 +1,152 @@
+/*
+ *
+ * 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.
+ *
+ */
+
+/* Posix implementation for gpr threads. */
+
+#include <grpc/support/port_platform.h>
+
+#ifdef GPR_POSIX_SYNC
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/sync.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/useful.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "src/core/lib/gpr/fork.h"
+
+static gpr_mu g_mu;
+static gpr_cv g_cv;
+static int g_thread_count;
+static int g_awaiting_threads;
+
+struct thd_arg {
+  void (*body)(void* arg); /* body of a thread */
+  void* arg;               /* argument to a thread */
+  const char* name;        /* name of thread. Can be nullptr. */
+};
+
+static void inc_thd_count();
+static void dec_thd_count();
+
+/* Body of every thread started via gpr_thd_new. */
+static void* thread_body(void* v) {
+  struct thd_arg a = *(struct thd_arg*)v;
+  free(v);
+  if (a.name != nullptr) {
+#if GPR_APPLE_PTHREAD_NAME
+    /* Apple supports 64 characters, and will truncate if it's longer. */
+    pthread_setname_np(a.name);
+#elif GPR_LINUX_PTHREAD_NAME
+    /* Linux supports 16 characters max, and will error if it's longer. */
+    char buf[16];
+    size_t buf_len = GPR_ARRAY_SIZE(buf) - 1;
+    strncpy(buf, a.name, buf_len);
+    buf[buf_len] = '\0';
+    pthread_setname_np(pthread_self(), buf);
+#endif  // GPR_APPLE_PTHREAD_NAME
+  }
+  (*a.body)(a.arg);
+  dec_thd_count();
+  return nullptr;
+}
+
+int gpr_thd_new(gpr_thd_id* t, const char* thd_name,
+                void (*thd_body)(void* arg), void* arg,
+                const gpr_thd_options* options) {
+  int thread_started;
+  pthread_attr_t attr;
+  pthread_t p;
+  /* don't use gpr_malloc as we may cause an infinite recursion with
+   * the profiling code */
+  struct thd_arg* a = (struct thd_arg*)malloc(sizeof(*a));
+  GPR_ASSERT(a != nullptr);
+  a->body = thd_body;
+  a->arg = arg;
+  a->name = thd_name;
+  inc_thd_count();
+
+  GPR_ASSERT(pthread_attr_init(&attr) == 0);
+  if (gpr_thd_options_is_detached(options)) {
+    GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) ==
+               0);
+  } else {
+    GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE) ==
+               0);
+  }
+  thread_started = (pthread_create(&p, &attr, &thread_body, a) == 0);
+  GPR_ASSERT(pthread_attr_destroy(&attr) == 0);
+  if (!thread_started) {
+    /* don't use gpr_free, as this was allocated using malloc (see above) */
+    free(a);
+    dec_thd_count();
+  }
+  *t = (gpr_thd_id)p;
+  return thread_started;
+}
+
+gpr_thd_id gpr_thd_currentid(void) { return (gpr_thd_id)pthread_self(); }
+
+void gpr_thd_join(gpr_thd_id t) { pthread_join((pthread_t)t, nullptr); }
+
+/*****************************************
+ * Only used when fork support is enabled
+ */
+
+static void inc_thd_count() {
+  if (grpc_fork_support_enabled()) {
+    gpr_mu_lock(&g_mu);
+    g_thread_count++;
+    gpr_mu_unlock(&g_mu);
+  }
+}
+
+static void dec_thd_count() {
+  if (grpc_fork_support_enabled()) {
+    gpr_mu_lock(&g_mu);
+    g_thread_count--;
+    if (g_awaiting_threads && g_thread_count == 0) {
+      gpr_cv_signal(&g_cv);
+    }
+    gpr_mu_unlock(&g_mu);
+  }
+}
+
+void gpr_thd_init() {
+  gpr_mu_init(&g_mu);
+  gpr_cv_init(&g_cv);
+  g_thread_count = 0;
+  g_awaiting_threads = 0;
+}
+
+int gpr_await_threads(gpr_timespec deadline) {
+  gpr_mu_lock(&g_mu);
+  g_awaiting_threads = 1;
+  int res = 0;
+  if (g_thread_count > 0) {
+    res = gpr_cv_wait(&g_cv, &g_mu, deadline);
+  }
+  g_awaiting_threads = 0;
+  gpr_mu_unlock(&g_mu);
+  return res == 0;
+}
+
+#endif /* GPR_POSIX_SYNC */