diff options
Diffstat (limited to 'linuxthreads/sysdeps/pthread/getcpuclockid.c')
| -rw-r--r-- | linuxthreads/sysdeps/pthread/getcpuclockid.c | 69 |
1 files changed, 68 insertions, 1 deletions
diff --git a/linuxthreads/sysdeps/pthread/getcpuclockid.c b/linuxthreads/sysdeps/pthread/getcpuclockid.c index 032caeb081..117c22dd37 100644 --- a/linuxthreads/sysdeps/pthread/getcpuclockid.c +++ b/linuxthreads/sysdeps/pthread/getcpuclockid.c @@ -1,4 +1,5 @@ -/* Copyright (C) 2000, 2001, 2004 Free Software Foundation, Inc. +/* pthread_getcpuclockid -- Get POSIX clockid_t for a pthread_t. Linux version + Copyright (C) 2000, 2001, 2004 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 @@ -21,10 +22,76 @@ #include <sys/time.h> #include <time.h> #include <internals.h> +#include "kernel-features.h" +#include "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_cpu_posix_timers = 1; +# endif + if (!__libc_missing_posix_cpu_timers) + { + INTERNAL_SYSCALL_DECL (err); + int r = INTERNAL_SYSCALL (clock_getres, err, 2, tidclock, 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 |