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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 | /* pthread_getcpuclockid -- Get POSIX clockid_t for a pthread_t. Linux version Copyright (C) 2000, 2001, 2004, 2005 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; see the file COPYING.LIB. If not, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <pthread.h> #include <sys/time.h> #include <time.h> #include <internals.h> #include <spinlock.h> #include <bits/kernel-features.h> #include <kernel-posix-cpu-timers.h> #if !(__ASSUME_POSIX_CPU_TIMERS > 0) int __libc_missing_posix_cpu_timers attribute_hidden; #endif #if !(__ASSUME_POSIX_TIMERS > 0) int __libc_missing_posix_timers attribute_hidden; #endif int pthread_getcpuclockid (pthread_t thread_id, clockid_t *clock_id) { #ifdef __NR_clock_getres pthread_handle handle = thread_handle(thread_id); int pid; __pthread_lock (&handle->h_lock, NULL); if (nonexisting_handle (handle, thread_id)) { __pthread_unlock (&handle->h_lock); return ESRCH; } pid = handle->h_descr->p_pid; __pthread_unlock (&handle->h_lock); /* The clockid_t value is a simple computation from the PID. But we do a clock_getres call to validate it if we aren't yet sure we have the kernel support. */ const clockid_t pidclock = MAKE_PROCESS_CPUCLOCK (pid, CPUCLOCK_SCHED); # if !(__ASSUME_POSIX_CPU_TIMERS > 0) # if !(__ASSUME_POSIX_TIMERS > 0) if (__libc_missing_posix_timers && !__libc_missing_posix_cpu_timers) __libc_missing_posix_cpu_timers = 1; # endif if (!__libc_missing_posix_cpu_timers) { INTERNAL_SYSCALL_DECL (err); int r = INTERNAL_SYSCALL (clock_getres, err, 2, pidclock, NULL); if (!INTERNAL_SYSCALL_ERROR_P (r, err)) # endif { *clock_id = pidclock; return 0; } # if !(__ASSUME_POSIX_CPU_TIMERS > 0) # if !(__ASSUME_POSIX_TIMERS > 0) if (INTERNAL_SYSCALL_ERRNO (r, err) == ENOSYS) { /* The kernel doesn't support these calls at all. */ __libc_missing_posix_timers = 1; __libc_missing_posix_cpu_timers = 1; } else # endif if (INTERNAL_SYSCALL_ERRNO (r, err) == EINVAL) { /* The kernel doesn't support these clocks at all. */ __libc_missing_posix_cpu_timers = 1; } else return INTERNAL_SYSCALL_ERRNO (r, err); } # endif #endif #ifdef CLOCK_THREAD_CPUTIME_ID /* We need to store the thread ID in the CLOCKID variable together with a number identifying the clock. We reserve the low 3 bits for the clock ID and the rest for the thread ID. This is problematic if the thread ID is too large. But 29 bits should be fine. If some day more clock IDs are needed the ID part can be enlarged. The IDs are entirely internal. */ if (2 * PTHREAD_THREADS_MAX >= 1 << (8 * sizeof (*clock_id) - CLOCK_IDFIELD_SIZE)) return ERANGE; /* Store the number. */ *clock_id = CLOCK_THREAD_CPUTIME_ID | (thread_id << CLOCK_IDFIELD_SIZE); return 0; #else /* We don't have a timer for that. */ return ENOENT; #endif } |