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Problem: clock_gettime is now defined in macOS 10.12 SDK

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Solution: Rename the custom implementation of clock_gettime for macOS to
alt_clock_gettime and wrap all usage in preprocessor macros to only enable the
alternative version when using macOS <= 10.11.

This issue occurs when targeting macOS 10.11 or earlier but using the 10.12
or newer SDK.
This commit is contained in:
Robert Castle 2016-10-28 11:04:21 +01:00
parent 2e9264354c
commit 0dfb32a259
3 changed files with 12 additions and 2 deletions
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7
src/clock.cpp
View File

@ -58,7 +58,7 @@
#include <time.h>
#include <sys/time.h>
int clock_gettime (int clock_id, timespec *ts)
int alt_clock_gettime (int clock_id, timespec *ts)
{
// The clock_id specified is not supported on this system.
if (clock_id != CLOCK_REALTIME) {
@ -152,7 +152,12 @@ uint64_t zmq::clock_t::now_us ()
// Use POSIX clock_gettime function to get precise monotonic time.
struct timespec tv;
#if defined ZMQ_HAVE_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12
int rc = alt_clock_gettime (CLOCK_MONOTONIC, &tv);
#else
int rc = clock_gettime (CLOCK_MONOTONIC, &tv);
#endif
// Fix case where system has clock_gettime but CLOCK_MONOTONIC is not supported.
// This should be a configuration check, but I looked into it and writing an
// AC_FUNC_CLOCK_MONOTONIC seems beyond my powers.

2
src/clock.hpp
View File

@ -37,7 +37,7 @@
#include <mach/mach.h>
#include <time.h>
#include <sys/time.h>
int clock_gettime (int clock_id, timespec *ts);
int alt_clock_gettime (int clock_id, timespec *ts);
#ifndef CLOCK_REALTIME
#define CLOCK_REALTIME 0
#endif

5
src/condition_variable.hpp
View File

@ -159,7 +159,12 @@ namespace zmq
if (timeout_ != -1) {
struct timespec timeout;
#if defined ZMQ_HAVE_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12
alt_clock_gettime(CLOCK_REALTIME, &timeout);
#else
clock_gettime(CLOCK_REALTIME, &timeout);
#endif
timeout.tv_sec += timeout_ / 1000;
timeout.tv_nsec += (timeout_ % 1000) * 1000000;