Commit 8a7112c6 authored by Michael Lee's avatar Michael Lee Committed by Facebook Github Bot

Fix up and namespace clock_gettime and clock_getres for MacOS

Summary:
Resolve two issues with folly's clock_gettime() shim on Apple platforms (iOS, macOS, etc.):

When detecting whether folly should define clock_gettime() on Apple platforms, don't assume clock_gettime() is declared in Apple's headers just because MAC_OS_X_VERSION_10_12/__IPHONE_10_0 is defined. Someone might use a newer macOS or iOS SDK (which defines MAC_OS_X_VERSION_10_12/__IPHONE_10_0), but not have clock_gettime() (because _DARWIN_FEATURE_CLOCK_GETTIME isn't set).

When defining a shim for clock_gettime(), don't rely on Apple's clock_gettime() declaration. Instead, shadow Apple's declaration with our own. This prevents folly from inheriting Apple's availability and visibility attributes for clock_gettime().

Reviewed By: yfeldblum

Differential Revision: D5312574

fbshipit-source-id: f16634ce92ee6c299613d3db22f0537bd31ac14d
parent 4c7a736d
......@@ -43,6 +43,10 @@ static void duration_to_ts(
#include <mach/thread_act.h>
#include <mach/vm_map.h>
namespace folly {
namespace portability {
namespace time {
static std::chrono::nanoseconds time_value_to_ns(time_value_t t) {
return std::chrono::seconds(t.seconds) +
std::chrono::microseconds(t.microseconds);
......@@ -136,6 +140,10 @@ int clock_getres(clockid_t clk_id, struct timespec* ts) {
return 0;
}
} // namespace time
} // namespace portability
} // namespace folly
#elif defined(_WIN32)
#include <errno.h>
#include <locale.h>
......@@ -144,6 +152,10 @@ int clock_getres(clockid_t clk_id, struct timespec* ts) {
#include <folly/portability/Windows.h>
namespace folly {
namespace portability {
namespace time {
using unsigned_nanos = std::chrono::duration<uint64_t, std::nano>;
static unsigned_nanos filetimeToUnsignedNanos(FILETIME ft) {
......@@ -272,6 +284,10 @@ extern "C" int clock_gettime(clockid_t clock_id, struct timespec* tp) {
return -1;
}
}
} // namespace time
} // namespace portability
} // namespace folly
#else
#error No clock_gettime(3) compatibility wrapper available for this platform.
#endif
......
......@@ -20,6 +20,7 @@
#include <time.h>
#include <folly/portability/Config.h>
#include <folly/Portability.h>
// OSX is a pain. The XCode 8 SDK always declares clock_gettime
// even if the target OS version doesn't support it, so you get
......@@ -27,15 +28,10 @@
// solve that by pretending we have it here in the header and
// then enable our implementation on the source side so that
// gets linked in instead.
#if __MACH__ && \
#if __MACH__ && FOLLY_HAVE_CLOCK_GETTIME && \
(MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_12 || \
__IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_10_0)
#ifdef FOLLY_HAVE_CLOCK_GETTIME
#undef FOLLY_HAVE_CLOCK_GETTIME
#endif
#define FOLLY_HAVE_CLOCK_GETTIME 1
#define FOLLY_FORCE_CLOCK_GETTIME_DEFINITION 1
#endif
......@@ -47,10 +43,25 @@
#define CLOCK_MONOTONIC 1
#define CLOCK_PROCESS_CPUTIME_ID 2
#define CLOCK_THREAD_CPUTIME_ID 3
#endif
#if (!FOLLY_HAVE_CLOCK_GETTIME || FOLLY_FORCE_CLOCK_GETTIME_DEFINITION) && (defined(__MACH__) || defined(_WIN32))
namespace folly {
namespace portability {
namespace time {
typedef uint8_t clockid_t;
extern "C" int clock_gettime(clockid_t clk_id, struct timespec* ts);
extern "C" int clock_getres(clockid_t clk_id, struct timespec* ts);
int clock_gettime(clockid_t clk_id, struct timespec* ts);
int clock_getres(clockid_t clk_id, struct timespec* ts);
}
}
}
FOLLY_PUSH_WARNING
#if __CLANG_PREREQ(3, 0)
FOLLY_GCC_DISABLE_WARNING("-Wheader-hygiene")
#endif
/* using override */ using namespace folly::portability::time;
FOLLY_POP_WARNING
#endif
#ifdef _WIN32
......
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