newlib/winsup/cygwin/wait.cc

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/* wait.cc: Posix wait routines.
* cygtls.h (struct _local_storage): Add cw_timer member. * cygtls.cc (_cygtls::init_thread): Initialize locals.cw_timer. (_cygtls::fixup_after_fork): Ditto. * tlsoffsets.h: Regenerate. * ntdll.h (enum _TIMER_INFORMATION_CLASS): Define. (struct _TIMER_BASIC_INFORMATION): Define. (NtQueryTimer): Declare function. * thread.h (cancelable_wait): Change timeout argument to PLARGE_INTEGER and provide NULL default. (fast_mutex::lock): Adjust accordingly. (pthread_cond::wait): Change timeout argument to PLARGE_INTEGER and default to NULL. * thread.cc (cancelable_wait): Change timeout argument to PLARGE_INTEGER. Initialize _cygtls.locals.cw_timer if needed. Use NT waitable timers for handling timeout. Return remaining time to timeout argument if timeout was relative. (pthread_cond::wait): Change timeout argument to PLARGE_INTEGER. Adjust to change in cancelable_wait. (pthread_mutex::lock): Adjust to change in cancelable_wait. (pthread_spinlock::lock): Ditto. (pthread::join): Ditto. (__pthread_cond_dowait): Change waitlength argument to PLARGE_INTEGER. Adjust to changes in cancelable_wait and pthread_cond::wait. (pthread_cond_timedwait): Adjust to change in __pthread_cond_dowait. (pthread_cond_wait): Ditto. (semaphore::_timedwait): Adjust to change in cancelable_wait. (semaphore::_wait): Ditto. * exceptions.cc (handle_sigsuspend): Ditto. * signal.cc (nanosleep): Ditto. * wait.cc (wait4): Ditto. Fix copyright dates. * times.cc (FACTOR, NSPERSEC): Move from here... * hires.h (FACTOR, NSPERSEC): ...to here.
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
2005, 2009, 2011, 2012 Red Hat, Inc.
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This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
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#include <sys/wait.h>
#include "sigproc.h"
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#include "thread.h"
Rename _threadinfo to _cygtls, throughout. * cygtls.h (_cygtls::call_signal_handler): Rename from call_signal_handler_now. (_cygtls::push): Make second argument mandatory. (_cygtls::fixup_after_fork): Declare new function. (_cygtls::lock): Ditto. * cygtls.cc (_cygtls::fixup_after_fork): Define new function. * dcrt0.cc (cygwin_finished_initializing): Define as bool. (alloc_stack): Use _tlstop rather than arbitrary variable in probably vain attempt to avoid strange fork problem on CTRL-C. (dll_crt0_0): Remove obsolete winpids::init call. * dll_init.cc (dll_dllcrt0): Detect forkee condition as equivalent to initializing. * winsup.h (cygwin_finished_initializing): Declare as bool. * exceptions.cc (handle_exceptions): Rely on cygwin_finished_initializing to determine how to handle exception during process startup. (_cygtls::call_signal_handler): Rename from call_signal_handler_now. (_cygtls::interrupt_now): Fill in second argument to push. (signal_fixup_after_fork): Eliminate. (setup_handler): Initialize locked to avoid potential inappropriate unlock. Resume thread if it has acquired the stack lock. (ctrl_c_handler): Just exit if ctrl-c is hit before cygiwn has finished initializing. * fork.cc (sync_with_child): Don't call abort since it can cause exit deadlocks. (sync_with_child): Change debugging output slightly. (fork_child): Set cygwin_finished_initializing here. Call _cygtls fork fixup and explicitly call sigproc_init. (fork_parent): Release malloc lock on fork failure. (vfork): Call signal handler via _my_tls. * sigproc.cc (sig_send): Ditto. * syscalls.cc (readv): Ditto. * termios.cc (tcsetattr): Ditto. * wait.cc (wait4): Ditto. * signal.cc (nanosleep): Ditto. (abort): Ditto. (kill_pgrp): Avoid killing self if exiting. * sync.cc (muto::acquire): Remove (temporarily?) ill-advised exiting_thread check. * gendef (_sigfe): Be more agressive in protecting stack pointer from other access by signal thread. (_cygtls::locked): Define new function. (_sigbe): Ditto. (_cygtls::pop): Protect edx. (_cygtls::lock): Use guaranteed method to set eax to 1. (longjmp): Aggressively protect signal stack. * miscfuncs.cc (low_priority_sleep): Reduce "sleep time" for secs == 0. * pinfo.cc (winpids::set): Counterintuitively use malloc's lock to protect simultaneous access to the pids list since there are pathological conditions which can cause malloc to call winpid. (winpids::init): Eliminate. * pinfo.h (winpids::cs): Eliminate declaration. * pinfo.h (winpids::init): Eliminate definition.
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#include "cygtls.h"
#include "cygwait.h"
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/* This is called _wait and not wait because the real wait is defined
in libc/syscalls/syswait.c. It calls us. */
extern "C" pid_t
wait (int *status)
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{
return wait4 (-1, status, 0, NULL);
}
extern "C" pid_t
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waitpid (pid_t intpid, int *status, int options)
{
return wait4 (intpid, status, options, NULL);
}
extern "C" pid_t
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wait3 (int *status, int options, struct rusage *r)
{
return wait4 (-1, status, options, r);
}
/* Wait for any child to complete.
* Note: this is not thread safe. Use of wait in multiple threads will
* not work correctly.
*/
extern "C" pid_t
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wait4 (int intpid, int *status, int options, struct rusage *r)
{
int res;
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HANDLE waitfor;
waitq *w = &_my_tls.wq;
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pthread_testcancel ();
while (1)
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{
sig_dispatch_pending ();
if (options & ~(WNOHANG | WUNTRACED | WCONTINUED))
{
set_errno (EINVAL);
res = -1;
break;
}
if (r)
memset (r, 0, sizeof (*r));
w->pid = intpid;
w->options = options;
w->rusage = r;
sigproc_printf ("calling proc_subproc, pid %d, options %d",
w->pid, w->options);
if (!proc_subproc (PROC_WAIT, (DWORD) w))
{
set_errno (ENOSYS);
paranoid_printf ("proc_subproc returned 0");
res = -1;
break;
}
if ((waitfor = w->ev) == NULL)
goto nochildren;
* DevNotes: Add entry cgf-000013. * cygserver_ipc.h (ipc_set_proc_info): Use _cygtls::ipc_set_proc_info to set per-thread signal arrived value. * cygthread.cc (cygthread::detach): Use per-thread signal_arrived via set_thread_waiting. * fork.cc (_cygtls::fixup_after_fork): Clear signal_arrived. (_cygtls::remove): Close any signal_arrived handle when thread exists. (_cygtls::find_tls): Remove unneeded function. * cygtls.h: Update copyright. (class _cygtls): Reorganize to help avoid rebuilding newlib when structure changes. (_cygtls::event): Delete. (_cygtls::threadkill): Ditto. (_cygtls::signal_waiting): Declare new bool. (_cygtls::find_tls): Delete declaration. (_cygtls::set_threadkill): Ditto. (_cygtls::reset_threadkill): Ditto. (_cygtls::set_signal_arrived): Declare new function. (class set_thread_waiting): Declare new class. * cygwait.cc (cw_nowait_storage): Define. (cygwait): Set per-thread signal_arrived via set_thread_waiting. Don't special-case _main_tls. * cygwait.h (cw_nowait): Define. (cw_infinite): Ditto. (cygwait): Redefine pathological wait-only case. * dcrt0.cc (dll_crt0_0): Remove call to now-defunct events_init(). (dll_crt0_1): Remove call to now-defunct create_signal_arrived(). * exceptions.cc: Reflect set_signal_mask() argument reordering throughout. Remove signal mask synchronization throughout. (events_init): Delete definition. (mask_sync): Delete now-unneeded mask synchronization. (set_signal_mask): Reverse order of arguments to "standard" to, from layout. Rename "newmask" argument to "setmask". Remove debugging. (sig_handle_tty_stop): Use cancelable_wait rather than WFMO. (_cygtls::interrupt_setup): Don't treat "threadkill" events specially. Conditionally set signal_arrived depending on whether the thread has created it or not. (sigpacket::process): Reorganize to reflect thread-specific sending of signals which is more in line with the way it was actually supposed to work. * fhandler_socket.cc (get_inet_addr): Use cancelable_wait rather than IsEventSignalled to avoid potential race. (fhandler_socket::wait_for_events): Set signal_arrived event using set_thread_waiting(). (fhandler_socket::close): Use cygwait for the case of just waiting 10 ms for a signal. * fhandler_tape.cc (fhandler_dev_tape::_lock): Use cancelable_wait rather than WFMO. Redo switch/case tests accordingly. * fhandler_termios.cc (fhandler_termios::bg_check): Use cygwait for case of just waiting 0 ms for a potential signal. * fhandler_tty.cc (fhandler_pty_master::process_slave_output): Use cancelable_wait rather than WFSO. * fhandler_windows.cc (fhandler_windows::read): Set per-thread signal_arrived via set_thread_waiting(). * flock.cc (lf_setlock): Ditto. * select.cc (pselect): Ditto. Set per-thread signal_arrived using set_thread_waiting(). * gendef: Don't special case handling of _cygtls::sig for threads. * gentls_offsets: Use #pragma once in tlsoffsets.h. * ntdll.h: Use #pragma once. * poll.cc: Reflect set_signal_mask() argument reordering. * posix_ipc.cc (ipc_mutex_lock): Use cancelable_wait rather than WFMO. (ipc_cond_timedwait): Set perl-thread signal arrived using set_thread_waiting(). * security.h: Use #pragma once. * signal.cc (abort): Reflect set_signal_mask() argument reordering. (clock_nanosleep): Ditto. Change call to cancelable_wait to properly specify handling of cancel and interrupt. (sigwaitinfo): Remove handling of per-thread event in favor of per-thread signal_arrived. Use cancelable_wait rather than WFSO. * sigproc.cc (signal_arrived): Delete definition. (create_signal_arrived): Ditto. * sigproc.h (signal_arrived): Delete declaration. (set_signal_mask): Avoid defining as a "C" function. Don't conditionally declare. (create_signal_arrived): Delete declaration. * syscalls.cc (rename): Use cygwait() rather than WFSO. * thread.h (fast_mutex::lock): Use cw_infinite rather than LARGE_NULL. * wait.cc (wait4): Ditto. * thread.cc (pthread_mutex::lock): Ditto. (pthread::join): Ditto. (semaphore::_wait): Ditto. (pthread_kill): Remove set_threadkill() accommodation. * tlsoffsets.h: Regenerate.
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res = cancelable_wait (waitfor, cw_infinite, cw_cancel | cw_cancel_self);
sigproc_printf ("%d = cancelable_wait (...)", res);
if (w->ev == NULL)
{
nochildren:
/* found no children */
set_errno (ECHILD);
res = -1;
break;
}
if (w->status == -1)
{
if (_my_tls.call_signal_handler ())
continue;
set_sig_errno (EINTR);
res = -1;
}
else if (res != WAIT_OBJECT_0)
{
set_errno (EINVAL);
res = -1;
}
else if ((res = w->pid) != 0 && status)
*status = w->status;
break;
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}
syscall_printf ("%R = wait4(%d, %p, %d, %p)", res, intpid, w->status, options, r);
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w->status = -1;
return res;
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}