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Add a trivial race-fix from Chromium: do not try to re-detect whether we have a monotonic clock every time we make a new event_base.

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svn:r1427
This commit is contained in:
Nick Mathewson 2009-09-11 18:21:57 +00:00
parent 3b461a6d03
commit e3f89fa275
2 changed files with 8 additions and 0 deletions
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2
ChangeLog
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@ -18,6 +18,8 @@ Changes in 2.0.3-alpha:
o New functions to explicitly reference a socket used by an evhttp object. Patches from David Reiss. o New functions to explicitly reference a socket used by an evhttp object. Patches from David Reiss.
o When we send a BEV_EVENT_CONNECTED to indicate connected status, we no longer invoke the write callback as well unless we actually wrote data too. o When we send a BEV_EVENT_CONNECTED to indicate connected status, we no longer invoke the write callback as well unless we actually wrote data too.
o If the kernel tells us that there are a negative number of bytes to read from a socket, do not believe it. Fixes bug 2841177; found by Alexander Pronchenkov. o If the kernel tells us that there are a negative number of bytes to read from a socket, do not believe it. Fixes bug 2841177; found by Alexander Pronchenkov.
o Do not detect whether we have monotonic clock support every time a new event base is created: instead do it only once. Patch taken from Chromium.
Changes in 2.0.2-alpha: Changes in 2.0.2-alpha:
o Add a new flag to bufferevents to make all callbacks automatically deferred. o Add a new flag to bufferevents to make all callbacks automatically deferred.

6
event.c
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@ -151,9 +151,15 @@ detect_monotonic(void)
{ {
#if defined(_EVENT_HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC) #if defined(_EVENT_HAVE_CLOCK_GETTIME) && defined(CLOCK_MONOTONIC)
struct timespec ts; struct timespec ts;
static int use_monotonic_initialized = 0;
if (use_monotonic_initialized)
return;
if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0) if (clock_gettime(CLOCK_MONOTONIC, &ts) == 0)
use_monotonic = 1; use_monotonic = 1;
use_monotonic_initialized = 1;
#endif #endif
} }