From 5f5004df21cecd0f842ba6ac5610a8f3f9fd9413 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Fri, 28 Mar 2003 06:27:21 +0000 Subject: Update. * sysdeps/unix/sysv/linux/kernel-posix-timers.h: Don't declare __timer_helper_thread. Declare __start_helper_thread, __helper_once, and __helper_tid. (struct timer): Remove th and bar field. * sysdeps/unix/sysv/linux/timer_create.c (timer_create): Remove debugging code. Create only one helper thread. * sysdeps/unix/sysv/linux/timer_delete.c (timer_delete): Don't kill helper thread. * sysdeps/unix/sysv/linux/timer_routines.c (timer_helper_thread): Renamed. Define statically. Use thread info from siginfo. (__helper_once): New variable. (__helper_tid): New variable. (__reset_helper_control): New function. (__start_helper_thread): New function. --- nptl/sysdeps/unix/sysv/linux/timer_create.c | 57 +++++++++-------------------- 1 file changed, 17 insertions(+), 40 deletions(-) (limited to 'nptl/sysdeps/unix/sysv/linux/timer_create.c') diff --git a/nptl/sysdeps/unix/sysv/linux/timer_create.c b/nptl/sysdeps/unix/sysv/linux/timer_create.c index 97ffb6ddb6..915fa812e1 100644 --- a/nptl/sysdeps/unix/sysv/linux/timer_create.c +++ b/nptl/sysdeps/unix/sysv/linux/timer_create.c @@ -26,6 +26,7 @@ #include #include #include +#include #include "kernel-posix-timers.h" @@ -138,12 +139,16 @@ timer_create (clock_id, evp, timerid) if (__no_posix_timers > 0) # endif { - sigset_t ss; - sigemptyset (&ss); - sigaddset (&ss, TIMER_SIG); - pthread_sigmask (SIG_BLOCK, &ss, NULL); - struct timer *newp; + /* Create the helper thread. */ + pthread_once (&__helper_once, __start_helper_thread); + if (__helper_tid == 0) + { + /* No resources to start the helper thread. */ + __set_errno (EAGAIN); + return -1; + } + struct timer *newp; newp = (struct timer *) malloc (sizeof (struct timer)); if (newp == NULL) return -1; @@ -176,57 +181,29 @@ timer_create (clock_id, evp, timerid) (void) pthread_attr_setdetachstate (&newp->attr, PTHREAD_CREATE_DETACHED); - /* Set up the barrier for sychronization. */ - (void) pthread_barrier_init (&newp->bar, NULL, 2); - - /* The helper thread needs only very little resources - and should go away automatically when canceled. */ - pthread_attr_t attr; - (void) pthread_attr_init (&attr); - (void) pthread_attr_setdetachstate (&attr, - PTHREAD_CREATE_DETACHED); - (void) pthread_attr_setstacksize (&attr, PTHREAD_STACK_MIN); - - /* Create the helper thread for this timer. */ - int res = pthread_create (&newp->th, &attr, - __timer_helper_thread, newp); - if (res != 0) - goto err_out; - - /* No need for the attribute anymore. */ - (void) pthread_attr_destroy (&attr); - /* Create the event structure for the kernel timer. */ struct sigevent sev; sev.sigev_value.sival_ptr = newp; - sev.sigev_signo = TIMER_SIG; + sev.sigev_signo = SIGTIMER; sev.sigev_notify = SIGEV_SIGNAL | SIGEV_THREAD_ID; /* This is the thread ID of the helper thread. */ - sev._sigev_un._pad[0] = ((struct pthread *) newp->th)->tid; - - /* Wait until the helper thread is set up. */ - (void) pthread_barrier_wait (&newp->bar); - - /* No need for the barrier anymore. */ - (void) pthread_barrier_destroy (&newp->bar); + sev._sigev_un._pad[0] = __helper_tid; /* Create the timer. */ INTERNAL_SYSCALL_DECL (err); - res = INTERNAL_SYSCALL (timer_create, err, 3, clock_id, &sev, - &newp->ktimerid); + int res = INTERNAL_SYSCALL (timer_create, err, 3, clock_id, &sev, + &newp->ktimerid); if (! INTERNAL_SYSCALL_ERROR_P (res, err)) { *timerid = (timer_t) newp; return 0; } - /* Something went wrong. Kill the thread. */ - pthread_cancel (newp->th); /* Free the resources. */ - res = INTERNAL_SYSCALL_ERRNO (res, err); - err_out: free (newp); - __set_errno (res); + + __set_errno (INTERNAL_SYSCALL_ERRNO (res, err)); + return -1; } } -- cgit 1.4.1