Abseil Common Libraries (C++) (grcp 依赖)
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81 lines
3.0 KiB
81 lines
3.0 KiB
7 years ago
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#include "absl/time/clock.h"
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#include <sys/time.h>
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#include <ctime>
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#include <cstdint>
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#include "absl/base/internal/raw_logging.h"
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// These are not defined in the Xcode 7.3.1 SDK Headers.
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// Once we are no longer supporting Xcode 7.3.1 we can
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// remove these.
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#ifndef __WATCHOS_3_0
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#define __WATCHOS_3_0 30000
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#endif
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#ifndef __TVOS_10_0
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#define __TVOS_10_0 100000
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#endif
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#ifndef __IPHONE_10_0
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#define __IPHONE_10_0 100000
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#endif
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#ifndef __MAC_10_12
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#define __MAC_10_12 101200
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#endif
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namespace absl {
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namespace time_internal {
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static int64_t GetCurrentTimeNanosFromSystem() {
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#if (__MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_12) || \
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(__IPHONE_OS_VERSION_MAX_ALLOWED >= __IPHONE_10_0) || \
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(__WATCH_OS_VERSION_MAX_ALLOWED >= __WATCHOS_3_0) || \
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(__TV_OS_VERSION_MAX_ALLOWED >= __TVOS_10_0)
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// clock_gettime_nsec_np is not defined on SDKs before Xcode 8.0.
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// This preprocessor logic is based upon __CLOCK_AVAILABILITY in
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// usr/include/time.h. Once we are no longer supporting Xcode 7.3.1 we can
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// remove this #if.
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// We must continue to check if it is defined until we are sure that ALL the
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// platforms we are shipping on support it.
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// clock_gettime_nsec_np is preferred because it may give higher accuracy than
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// gettimeofday in future Apple operating systems.
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// Currently (macOS 10.12/iOS 10.2) clock_gettime_nsec_np accuracy is
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// microsecond accuracy (i.e. equivalent to gettimeofday).
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if (&clock_gettime_nsec_np != nullptr) {
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return clock_gettime_nsec_np(CLOCK_REALTIME);
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}
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#endif
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#if (defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && \
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(__MAC_OS_X_VERSION_MIN_REQUIRED < __MAC_10_12)) || \
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(defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && \
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(__IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_10_0)) || \
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(defined(__WATCH_OS_VERSION_MIN_REQUIRED) && \
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(__WATCH_OS_VERSION_MIN_REQUIRED < __WATCHOS_3_0)) || \
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(defined(__TV_OS_VERSION_MIN_REQUIRED) && \
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(__TV_OS_VERSION_MIN_REQUIRED < __TVOS_10_0))
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// We need this block in 2 different cases:
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// a) where we are compiling with Xcode 7 in which case the block above
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// will not be compiled in, and this is the only block executed.
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// b) where we are compiling with Xcode 8+ but supporting operating systems
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// that do not define clock_gettime_nsec_np, so this is in effect
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// an else block to the block above.
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// This block will not be compiled if the min supported version is
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// guaranteed to supply clock_gettime_nsec_np.
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//
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// Once we know that clock_gettime_nsec_np is in the SDK *AND* exists on
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// all the platforms we support, we can remove both this block and alter the
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// block above to just call clock_gettime_nsec_np directly.
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const int64_t kNanosPerSecond = 1000 * 1000 * 1000;
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const int64_t kNanosPerMicrosecond = 1000;
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struct timeval tp;
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ABSL_RAW_CHECK(gettimeofday(&tp, nullptr) == 0, "Failed gettimeofday");
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return (int64_t{tp.tv_sec} * kNanosPerSecond +
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int64_t{tp.tv_usec} * kNanosPerMicrosecond);
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#endif
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}
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} // namespace time_internal
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} // namespace absl
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