Port [] alarm management to GRPC.

This change implements a platform independent alarm manager in alarm.c.
It's integrated with iomgr, and some tests are cleaned up.

The alarm implementation itself is a fairly direct port of LazyAlarmList from eventmanager.
SpinLock has been replaced for now with gpr_mu, and other atomic operations have been dropped (again, for now).
A majority of tests have been ported.
	Change on 2014/12/19 by ctiller <ctiller@google.com>
-------------
Created by MOE: http://code.google.com/p/moe-java
MOE_MIGRATED_REVID=82551363

1 files changed, 8 insertions, 0 deletions

diff --git a/src/core/support/time.c b/src/core/support/time.c
index 1d8765f8cc..712bdf441c 100644
--- a/src/core/support/time.c
+++ b/src/core/support/time.c
@@ -47,6 +47,14 @@ int gpr_time_cmp(gpr_timespec a, gpr_timespec b) {
   return cmp;
 }
 
+gpr_timespec gpr_time_min(gpr_timespec a, gpr_timespec b) {
+  return gpr_time_cmp(a, b) < 0 ? a : b;
+}
+
+gpr_timespec gpr_time_max(gpr_timespec a, gpr_timespec b) {
+  return gpr_time_cmp(a, b) > 0 ? a : b;
+}
+
 /* There's no standard TIME_T_MIN and TIME_T_MAX, so we construct them.  The
    following assumes that signed types are two's-complement and that bytes are
    8 bits.  */