diff options
Diffstat (limited to 'src/core/lib/support/time_posix.c')
| -rw-r--r-- | src/core/lib/support/time_posix.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/src/core/lib/support/time_posix.c b/src/core/lib/support/time_posix.c new file mode 100644 index 0000000000..fcfab2f2fa --- /dev/null +++ b/src/core/lib/support/time_posix.c @@ -0,0 +1,170 @@ +/* + * + * Copyright 2015-2016, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <grpc/support/port_platform.h> +#include "src/core/lib/support/time_precise.h" + +#ifdef GPR_POSIX_TIME + +#include <stdlib.h> +#include <time.h> +#include <unistd.h> +#ifdef __linux__ +#include <sys/syscall.h> +#endif +#include <grpc/support/log.h> +#include <grpc/support/time.h> +#include "src/core/lib/support/block_annotate.h" + +static struct timespec timespec_from_gpr(gpr_timespec gts) { + struct timespec rv; + if (sizeof(time_t) < sizeof(int64_t)) { + /* fine to assert, as this is only used in gpr_sleep_until */ + GPR_ASSERT(gts.tv_sec <= INT32_MAX && gts.tv_sec >= INT32_MIN); + } + rv.tv_sec = (time_t)gts.tv_sec; + rv.tv_nsec = gts.tv_nsec; + return rv; +} + +#if _POSIX_TIMERS > 0 +static gpr_timespec gpr_from_timespec(struct timespec ts, + gpr_clock_type clock_type) { + /* + * timespec.tv_sec can have smaller size than gpr_timespec.tv_sec, + * but we are only using this function to implement gpr_now + * so there's no need to handle "infinity" values. + */ + gpr_timespec rv; + rv.tv_sec = ts.tv_sec; + rv.tv_nsec = (int32_t)ts.tv_nsec; + rv.clock_type = clock_type; + return rv; +} + +/** maps gpr_clock_type --> clockid_t for clock_gettime */ +static const clockid_t clockid_for_gpr_clock[] = {CLOCK_MONOTONIC, + CLOCK_REALTIME}; + +void gpr_time_init(void) { gpr_precise_clock_init(); } + +gpr_timespec gpr_now(gpr_clock_type clock_type) { + struct timespec now; + GPR_ASSERT(clock_type != GPR_TIMESPAN); + if (clock_type == GPR_CLOCK_PRECISE) { + gpr_timespec ret; + gpr_precise_clock_now(&ret); + return ret; + } else { +#if defined(GPR_BACKWARDS_COMPATIBILITY_MODE) && defined(__linux__) + /* avoid ABI problems by invoking syscalls directly */ + syscall(SYS_clock_gettime, clockid_for_gpr_clock[clock_type], &now); +#else + clock_gettime(clockid_for_gpr_clock[clock_type], &now); +#endif + return gpr_from_timespec(now, clock_type); + } +} +#else +/* For some reason Apple's OSes haven't implemented clock_gettime. */ + +#include <mach/mach.h> +#include <mach/mach_time.h> +#include <sys/time.h> + +static double g_time_scale; +static uint64_t g_time_start; + +void gpr_time_init(void) { + mach_timebase_info_data_t tb = {0, 1}; + gpr_precise_clock_init(); + mach_timebase_info(&tb); + g_time_scale = tb.numer; + g_time_scale /= tb.denom; + g_time_start = mach_absolute_time(); +} + +gpr_timespec gpr_now(gpr_clock_type clock) { + gpr_timespec now; + struct timeval now_tv; + double now_dbl; + + now.clock_type = clock; + switch (clock) { + case GPR_CLOCK_REALTIME: + gettimeofday(&now_tv, NULL); + now.tv_sec = now_tv.tv_sec; + now.tv_nsec = now_tv.tv_usec * 1000; + break; + case GPR_CLOCK_MONOTONIC: + now_dbl = (mach_absolute_time() - g_time_start) * g_time_scale; + now.tv_sec = (int64_t)(now_dbl * 1e-9); + now.tv_nsec = (int32_t)(now_dbl - ((double)now.tv_sec) * 1e9); + break; + case GPR_CLOCK_PRECISE: + gpr_precise_clock_now(&now); + break; + case GPR_TIMESPAN: + abort(); + } + + return now; +} +#endif + +void gpr_sleep_until(gpr_timespec until) { + gpr_timespec now; + gpr_timespec delta; + struct timespec delta_ts; + int ns_result; + + for (;;) { + /* We could simplify by using clock_nanosleep instead, but it might be + * slightly less portable. */ + now = gpr_now(until.clock_type); + if (gpr_time_cmp(until, now) <= 0) { + return; + } + + delta = gpr_time_sub(until, now); + delta_ts = timespec_from_gpr(delta); + GRPC_SCHEDULING_START_BLOCKING_REGION; + ns_result = nanosleep(&delta_ts, NULL); + GRPC_SCHEDULING_END_BLOCKING_REGION; + if (ns_result == 0) { + break; + } + } +} + +#endif /* GPR_POSIX_TIME */ |