1 files changed, 138 insertions, 0 deletions
diff --git a/src/core/profiling/timers.c b/src/core/profiling/timers.c
new file mode 100644
index 0000000000..478397d1bf
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+++ b/src/core/profiling/timers.c
@@ -0,0 +1,138 @@
+/*
+ *
+ * Copyright 2015, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifdef GRPC_LATENCY_PROFILER
+
+#include "src/core/profiling/timers.h"
+#include "src/core/profiling/timers_preciseclock.h"
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/time.h>
+#include <grpc/support/sync.h>
+#include <stdio.h>
+
+typedef struct grpc_timer_entry {
+  grpc_precise_clock tm;
+  const char* tag;
+  int seq;
+  const char* file;
+  int line;
+} grpc_timer_entry;
+
+struct grpc_timers_log {
+  gpr_mu mu;
+  grpc_timer_entry* log;
+  int num_entries;
+  int capacity;
+  int capacity_limit;
+  FILE* fp;
+};
+
+grpc_timers_log* grpc_timers_log_global = NULL;
+
+grpc_timers_log* grpc_timers_log_create(int capacity_limit, FILE* dump) {
+  grpc_timers_log* log = gpr_malloc(sizeof(*log));
+
+  /* TODO (vpai): Allow allocation below limit */
+  log->log = gpr_malloc(capacity_limit * sizeof(*log->log));
+
+  /* TODO (vpai): Improve concurrency, do per-thread logging? */
+  gpr_mu_init(&log->mu);
+
+  log->num_entries = 0;
+  log->capacity = log->capacity_limit = capacity_limit;
+
+  log->fp = dump;
+
+  return log;
+}
+
+static void log_report_locked(grpc_timers_log* log) {
+  FILE* fp = log->fp;
+  int i;
+  for (i = 0; i < log->num_entries; i++) {
+    grpc_timer_entry* entry = &(log->log[i]);
+    fprintf(fp, "GRPC_LAT_PROF ");
+    grpc_precise_clock_print(&entry->tm, fp);
+    fprintf(fp, " %s#%d,%s:%d\n", entry->tag, entry->seq, entry->file,
+            entry->line);
+  }
+
+  /* Now clear out the log */
+  log->num_entries = 0;
+}
+
+void grpc_timers_log_destroy(grpc_timers_log* log) {
+  gpr_mu_lock(&log->mu);
+  log_report_locked(log);
+  gpr_mu_unlock(&log->mu);
+
+  gpr_free(log->log);
+  gpr_mu_destroy(&log->mu);
+
+  gpr_free(log);
+}
+
+void grpc_timers_log_add(grpc_timers_log* log, const char* tag, int seq,
+                         const char* file, int line) {
+  grpc_timer_entry* entry;
+
+  /* TODO (vpai) : Improve concurrency */
+  gpr_mu_lock(&log->mu);
+  if (log->num_entries == log->capacity_limit) {
+    log_report_locked(log);
+  }
+
+  entry = &log->log[log->num_entries++];
+
+  grpc_precise_clock_now(&entry->tm);
+  entry->tag = tag;
+  entry->seq = seq;
+  entry->file = file;
+  entry->line = line;
+
+  gpr_mu_unlock(&log->mu);
+}
+
+void grpc_timers_log_global_init(void) {
+  grpc_timers_log_global = grpc_timers_log_create(100000, stdout);
+}
+
+void grpc_timers_log_global_destroy(void) {
+  grpc_timers_log_destroy(grpc_timers_log_global);
+}
+#else  /* !GRPC_LATENCY_PROFILER */
+void grpc_timers_log_global_init(void) {}
+void grpc_timers_log_global_destroy(void) {}
+#endif /* GRPC_LATENCY_PROFILER */