Add amqp_get_monotonic_timestamp() function

1 files changed, 94 insertions, 0 deletions

diff --git a/librabbitmq/amqp_timer.c b/librabbitmq/amqp_timer.c
new file mode 100644
index 0000000..aa7f6d4
--- /dev/null
+++ b/librabbitmq/amqp_timer.c
@@ -0,0 +1,94 @@
+/* vim:set ft=c ts=2 sw=2 sts=2 et cindent: */
+/*
+ * Copyright 2013 Alan Antonuk
+ *
+ * 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 "amqp_timer.h"
+
+#if (defined(_WIN32) || defined(__WIN32__) || defined(WIN32))
+# define AMQP_WIN_TIMER_API
+#elif (defined(machintosh) || defined(__APPLE__) || defined(__APPLE_CC__))
+# define AMQP_MAC_TIMER_API
+#else
+# define AMQP_POSIX_TIMER_API
+#endif
+
+
+#ifdef AMQP_WIN_TIMER_API
+#define WIN32_LEAN_AND_MEAN
+#include <Windows.h>
+
+uint64_t
+amqp_get_monotonic_timestamp(void)
+{
+  static uint64_t NS_PER_COUNT = 0;
+  LARGE_INTEGER perf_count;
+
+  if (0 == NS_PER_COUNT) {
+    LARGE_INTEGER perf_frequency;
+    if (!QueryPerformanceFrequency(&perf_frequency)) {
+      return 0;
+    }
+    NS_PER_COUNT = AMQP_NS_PER_S / perf_frequency.QuadPart;
+  }
+
+  if (!QueryPerformanceCounter(&perf_count)) {
+    return 0;
+  }
+
+  return perf_count.QuadPart * NS_PER_COUNT;
+}
+#endif /* AMQP_WIN_TIMER_API */
+
+#ifdef AMQP_MAC_TIMER_API
+# include <mach/mach_time.h>
+
+uint64_t
+amqp_get_monotonic_timestamp(void)
+{
+  static mach_timebase_info_data_t s_timebase = {0, 0};
+  uint64_t timestamp;
+
+  timestamp = mach_absolute_time();
+
+  if (s_timebase.denom == 0) {
+    mach_timebase_info(&s_timebase);
+  }
+
+  timestamp = timestamp * s_timebase.numer / s_timebase.denom;
+
+  return timestamp;
+}
+#endif /* AMQP_MAC_TIMER_API */
+
+#ifdef AMQP_POSIX_TIMER_API
+#include <time.h>
+
+uint64_t
+amqp_get_monotonic_timestamp(void)
+{
+  struct timespec tp;
+  if (-1 == clock_gettime(CLOCK_MONOTONIC, &tp)) {
+    return 0;
+  }
+
+  return ((uint64_t)tp.tv_sec * AMQP_NS_PER_S + (uint64_t)tp.tv_nsec);
+}
+#endif /* AMQP_POSIX_TIMER_API */