| /* |
| * signal.c |
| * |
| * Description: |
| * Thread-aware signal functions. |
| * |
| * -------------------------------------------------------------------------- |
| * |
| * Pthreads-win32 - POSIX Threads Library for Win32 |
| * Copyright(C) 1998 John E. Bossom |
| * Copyright(C) 1999,2005 Pthreads-win32 contributors |
| * |
| * Contact Email: rpj@callisto.canberra.edu.au |
| * |
| * The current list of contributors is contained |
| * in the file CONTRIBUTORS included with the source |
| * code distribution. The list can also be seen at the |
| * following World Wide Web location: |
| * http://sources.redhat.com/pthreads-win32/contributors.html |
| * |
| * This 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 of the License, or (at your option) any later version. |
| * |
| * This 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 this library in the file COPYING.LIB; |
| * if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| */ |
| |
| /* |
| * Possible future strategy for implementing pthread_kill() |
| * ======================================================== |
| * |
| * Win32 does not implement signals. |
| * Signals are simply software interrupts. |
| * pthread_kill() asks the system to deliver a specified |
| * signal (interrupt) to a specified thread in the same |
| * process. |
| * Signals are always asynchronous (no deferred signals). |
| * Pthread-win32 has an async cancelation mechanism. |
| * A similar system can be written to deliver signals |
| * within the same process (on ix86 processors at least). |
| * |
| * Each thread maintains information about which |
| * signals it will respond to. Handler routines |
| * are set on a per-process basis - not per-thread. |
| * When signalled, a thread will check it's sigmask |
| * and, if the signal is not being ignored, call the |
| * handler routine associated with the signal. The |
| * thread must then (except for some signals) return to |
| * the point where it was interrupted. |
| * |
| * Ideally the system itself would check the target thread's |
| * mask before possibly needlessly bothering the thread |
| * itself. This could be done by pthread_kill(), that is, |
| * in the signaling thread since it has access to |
| * all pthread_t structures. It could also retrieve |
| * the handler routine address to minimise the target |
| * threads response overhead. This may also simplify |
| * serialisation of the access to the per-thread signal |
| * structures. |
| * |
| * pthread_kill() eventually calls a routine similar to |
| * ptw32_cancel_thread() which manipulates the target |
| * threads processor context to cause the thread to |
| * run the handler launcher routine. pthread_kill() must |
| * save the target threads current context so that the |
| * handler launcher routine can restore the context after |
| * the signal handler has returned. Some handlers will not |
| * return, eg. the default SIGKILL handler may simply |
| * call pthread_exit(). |
| * |
| * The current context is saved in the target threads |
| * pthread_t structure. |
| */ |
| |
| #include "pthread.h" |
| #include "implement.h" |
| |
| #if defined(HAVE_SIGSET_T) |
| |
| static void |
| ptw32_signal_thread () |
| { |
| } |
| |
| static void |
| ptw32_signal_callhandler () |
| { |
| } |
| |
| int |
| pthread_sigmask (int how, sigset_t const *set, sigset_t * oset) |
| { |
| pthread_t thread = pthread_self (); |
| |
| if (thread.p == NULL) |
| { |
| return ENOENT; |
| } |
| |
| /* Validate the `how' argument. */ |
| if (set != NULL) |
| { |
| switch (how) |
| { |
| case SIG_BLOCK: |
| break; |
| case SIG_UNBLOCK: |
| break; |
| case SIG_SETMASK: |
| break; |
| default: |
| /* Invalid `how' argument. */ |
| return EINVAL; |
| } |
| } |
| |
| /* Copy the old mask before modifying it. */ |
| if (oset != NULL) |
| { |
| memcpy (oset, &(thread.p->sigmask), sizeof (sigset_t)); |
| } |
| |
| if (set != NULL) |
| { |
| unsigned int i; |
| |
| /* FIXME: this code assumes that sigmask is an even multiple of |
| the size of a long integer. */ |
| |
| unsigned long *src = (unsigned long const *) set; |
| unsigned long *dest = (unsigned long *) &(thread.p->sigmask); |
| |
| switch (how) |
| { |
| case SIG_BLOCK: |
| for (i = 0; i < (sizeof (sigset_t) / sizeof (unsigned long)); i++) |
| { |
| /* OR the bit field longword-wise. */ |
| *dest++ |= *src++; |
| } |
| break; |
| case SIG_UNBLOCK: |
| for (i = 0; i < (sizeof (sigset_t) / sizeof (unsigned long)); i++) |
| { |
| /* XOR the bitfield longword-wise. */ |
| *dest++ ^= *src++; |
| } |
| case SIG_SETMASK: |
| /* Replace the whole sigmask. */ |
| memcpy (&(thread.p->sigmask), set, sizeof (sigset_t)); |
| break; |
| } |
| } |
| |
| return 0; |
| } |
| |
| int |
| sigwait (const sigset_t * set, int *sig) |
| { |
| /* This routine is a cancellation point */ |
| pthread_test_cancel(); |
| } |
| |
| int |
| sigaction (int signum, const struct sigaction *act, struct sigaction *oldact) |
| { |
| } |
| |
| #endif /* HAVE_SIGSET_T */ |