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* exceptions.cc (interruptible): Make a little more structured.

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(call_handler): Allow signals to be sent even if signalled thread is stopped.
Change order of signal_arrived arming/waiting threads clearing to eliminate a
race.
(reset_signal_arrived): New helper function.
* malloc.cc (malloc_init): Use mutos so that signal handler can keep track of
who owns the lock.
(__malloc_lock): Ditto.
(__malloc_unlock): Ditto.
* sync.h (new_muto): Actually use a muto for the "buffer".
* Makefile.in: Fix a dependency.
This commit is contained in:
Christopher Faylor
2000-02-26 01:11:54 +00:00
parent 52aaab48f4
commit 8656ee07ef
11 changed files with 77 additions and 46 deletions
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73
winsup/cygwin/exceptions.cc
View File

@@ -18,6 +18,7 @@ details. */
#define DECLSPEC_IMPORT
#include <imagehlp.h>
#include "autoload.h"
#include "sync.h"
char debugger_command[2 * MAX_PATH + 20];
@@ -557,7 +558,7 @@ handle_exceptions (EXCEPTION_RECORD *e, void *, CONTEXT *in, void *)
bp -= 2;
break;
}
in->Ebp = (DWORD) bp;
sigsave.cx = in;
sig_send (NULL, sig); // Signal myself
@@ -621,21 +622,28 @@ interruptible (DWORD pc)
return ((pc >= (DWORD) &__sigfirst) && (pc <= (DWORD) &__siglast)) ||
!(pchigh == 0xb0000000 || pchigh == 0x70000000 || pchigh == 0x60000000);
#else
int res = 1;
if ((pc >= (DWORD) &__sigfirst) && (pc <= (DWORD) &__siglast))
return 1;
res = 0;
else
{
MEMORY_BASIC_INFORMATION m;
memset (&m, 0, sizeof m);
if (!VirtualQuery ((LPCVOID) pc, &m, sizeof m))
sigproc_printf ("couldn't get memory info, %E");
MEMORY_BASIC_INFORMATION m;
memset (&m, 0, sizeof m);
if (!VirtualQuery ((LPCVOID) pc, &m, sizeof m))
sigproc_printf ("couldn't get memory info, %E");
char *checkdir = (char *) alloca (windows_system_directory_length);
# define h ((HMODULE) m.AllocationBase)
if (h == cygwin_hmodule)
res = 0;
else if (!GetModuleFileName (h, checkdir, windows_system_directory_length))
res = 0;
else
res = !strncasematch (windows_system_directory, checkdir,
windows_system_directory_length);
}
# define h ((HMODULE) m.AllocationBase)
if (h == cygwin_hmodule)
return 0;
char *checkdir = (char *) alloca (windows_system_directory_length);
if (!GetModuleFileName (h, checkdir, windows_system_directory_length))
return 0;
return !strncasematch (windows_system_directory, checkdir, windows_system_directory_length);
return res;
# undef h
#endif
}
@@ -727,7 +735,6 @@ call_handler (int sig, struct sigaction& siga, void *handler)
we have to do that since sometimes they don't return - and if
this thread doesn't return, you won't ever get another exception. */
sigproc_printf ("Suspending %p (mainthread)", myself->getthread2signal());
HANDLE hth = myself->getthread2signal ();
/* Suspend the thread which will receive the signal. But first ensure that
this thread doesn't have the sync_proc_subproc and mask_sync mutos, since
@@ -736,11 +743,9 @@ call_handler (int sig, struct sigaction& siga, void *handler)
already suspended (which should never occur) then just queue the signal. */
for (;;)
{
sigproc_printf ("suspending mainthread");
res = SuspendThread (hth);
if (res)
goto set_pending;
/* FIXME: Make multi-thread aware */
for (muto *m = muto_start.next; m != NULL; m = m->next)
if (m->unstable () || m->owner () == maintid)
@@ -749,10 +754,14 @@ call_handler (int sig, struct sigaction& siga, void *handler)
break;
keep_looping:
sigproc_printf ("suspended thread owns a muto");
if (res)
goto set_pending;
ResumeThread (hth);
Sleep (0);
}
sigproc_printf ("suspend said %d, %E", res);
if (sigsave.cx)
@@ -783,12 +792,6 @@ call_handler (int sig, struct sigaction& siga, void *handler)
interrupted = 0;
}
if (interrupted)
{
/* Clear any waiting threads prior to dispatching to handler function */
proc_subproc(PROC_CLEARWAIT, 1);
}
(void) ResumeThread (hth);
if (interrupted)
@@ -796,6 +799,8 @@ call_handler (int sig, struct sigaction& siga, void *handler)
/* Apparently we have to set signal_arrived after resuming the thread or it
is possible that the event will be ignored. */
(void) SetEvent (signal_arrived); // For an EINTR case
/* Clear any waiting threads prior to dispatching to handler function */
proc_subproc(PROC_CLEARWAIT, 1);
}
sigproc_printf ("armed signal_arrived %p, res %d", signal_arrived, res);
@@ -1068,6 +1073,15 @@ events_terminate (void)
#define pid_offset (unsigned)(((pinfo *)NULL)->pid)
extern "C" {
static void __stdcall
reset_signal_arrived () __attribute__ ((unused));
static void __stdcall
reset_signal_arrived ()
{
(void) ResetEvent (signal_arrived);
sigproc_printf ("reset signal_arrived");
}
void unused_sig_wrapper()
{
/* Signal cleanup stuff. Cleans up stack (too bad that we didn't
@@ -1076,7 +1090,6 @@ void unused_sig_wrapper()
and returns to orignal caller. */
__asm__ volatile ("
.text
___sigfirst:
.globl __raise
__raise:
pushl %%ebp
@@ -1120,19 +1133,21 @@ _sigdelayed:
pushl %3 # oldmask
pushl %4 # signal argument
pushl $_sigreturn
movl $0,%0
pushl _signal_arrived # Everybody waiting for this should
call _ResetEvent@4 # have woken up by now.
call _reset_signal_arrived@0
# pushl _signal_arrived # Everybody waiting for this should
# call _ResetEvent@4 # have woken up by now.
movl $0,%0
cmpl $0,_pending_signals
je 2f
___sigfirst:
pushl $0
call _sig_dispatch_pending@4
___siglast:
2: jmp *%5
___siglast:
" : "=m" (sigsave.sig) : "m" (&_impure_ptr->_errno),
"g" (sigsave.retaddr), "g" (sigsave.oldmask), "g" (sigsave.sig),
"g" (sigsave.func), "o" (pid_offset), "g" (sigsave.saved_errno)