diff options
Diffstat (limited to 'gi/pyp-topics/src/clock_gettime_stub.c')
| -rw-r--r-- | gi/pyp-topics/src/clock_gettime_stub.c | 141 |
1 files changed, 0 insertions, 141 deletions
diff --git a/gi/pyp-topics/src/clock_gettime_stub.c b/gi/pyp-topics/src/clock_gettime_stub.c deleted file mode 100644 index 4883b7c1..00000000 --- a/gi/pyp-topics/src/clock_gettime_stub.c +++ /dev/null @@ -1,141 +0,0 @@ -/* - * Copyright (c), MM Weiss - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without modification, - * are permitted provided that the following conditions are met: - * - * 1. Redistributions of source code must retain the above copyright notice, - * this list of conditions and the following disclaimer. - * - * 2. 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. - * - * 3. Neither the name of the MM Weiss 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. - */ - -/* - * clock_gettime_stub.c - * gcc -Wall -c clock_gettime_stub.c - * posix realtime functions; MacOS user space glue - */ - -/* @comment - * other possible implementation using intel builtin rdtsc - * rdtsc-workaround: http://www.mcs.anl.gov/~kazutomo/rdtsc.html - * - * we could get the ticks by doing this - * - * __asm __volatile("mov %%ebx, %%esi\n\t" - * "cpuid\n\t" - * "xchg %%esi, %%ebx\n\t" - * "rdtsc" - * : "=a" (a), - * "=d" (d) - * ); - - * we could even replace our tricky sched_yield call by assembly code to get a better accurency, - * anyway the following C stub will satisfy 99% of apps using posix clock_gettime call, - * moreover, the setter version (clock_settime) could be easly written using mach primitives: - * http://www.opensource.apple.com/source/xnu/xnu-${VERSION}/osfmk/man/ (clock_[set|get]_time) - * - * hackers don't be crackers, don't you use a flush toilet? - * - * - * @see draft: ./posix-realtime-stub/posix-realtime-stub.c - * - */ - - -#ifdef __APPLE__ - -#pragma weak clock_gettime - -#include <sys/time.h> -#include <sys/resource.h> -#include <mach/mach.h> -#include <mach/clock.h> -#include <mach/mach_time.h> -#include <errno.h> -#include <unistd.h> -#include <sched.h> - -typedef enum { - CLOCK_REALTIME, - CLOCK_MONOTONIC, - CLOCK_PROCESS_CPUTIME_ID, - CLOCK_THREAD_CPUTIME_ID -} clockid_t; - -static mach_timebase_info_data_t __clock_gettime_inf; - -static int clock_gettime(clockid_t clk_id, struct timespec *tp) { - kern_return_t ret; - clock_serv_t clk; - clock_id_t clk_serv_id; - mach_timespec_t tm; - - uint64_t start, end, delta, nano; - - //task_basic_info_data_t tinfo; - //task_thread_times_info_data_t ttinfo; - //mach_msg_type_number_t tflag; - - int retval = -1; - switch (clk_id) { - case CLOCK_REALTIME: - case CLOCK_MONOTONIC: - clk_serv_id = clk_id == CLOCK_REALTIME ? CALENDAR_CLOCK : SYSTEM_CLOCK; - if (KERN_SUCCESS == (ret = host_get_clock_service(mach_host_self(), clk_serv_id, &clk))) { - if (KERN_SUCCESS == (ret = clock_get_time(clk, &tm))) { - tp->tv_sec = tm.tv_sec; - tp->tv_nsec = tm.tv_nsec; - retval = 0; - } - } - if (KERN_SUCCESS != ret) { - errno = EINVAL; - retval = -1; - } - break; - case CLOCK_PROCESS_CPUTIME_ID: - case CLOCK_THREAD_CPUTIME_ID: - start = mach_absolute_time(); - if (clk_id == CLOCK_PROCESS_CPUTIME_ID) { - getpid(); - } else { - sched_yield(); - } - end = mach_absolute_time(); - delta = end - start; - if (0 == __clock_gettime_inf.denom) { - mach_timebase_info(&__clock_gettime_inf); - } - nano = delta * __clock_gettime_inf.numer / __clock_gettime_inf.denom; - tp->tv_sec = nano * 1e-9; - tp->tv_nsec = nano - (tp->tv_sec * 1e9); - retval = 0; - break; - default: - errno = EINVAL; - retval = -1; - } - return retval; -} - -#endif // __APPLE__ - -/* EOF */ |