From 7759daa979c4cdd83063ce6af1047727cb2d2071 Mon Sep 17 00:00:00 2001 From: Christopher Faylor Date: Thu, 25 Sep 2003 03:06:36 +0000 Subject: [PATCH] * shared_info.h (CURR_MOUNT_MAGIC): Fix. * sigproc.cc (sigpacket): New structure. (sig_send): Fill out sigpacket structure to send to signal thread rather than racily sending separate packets. (wait_sig): Use sigpacket structure to receive info from signal sender. --- winsup/cygwin/ChangeLog | 9 +++ winsup/cygwin/shared_info.h | 2 +- winsup/cygwin/sigproc.cc | 127 +++++++++++++++++------------------- 3 files changed, 70 insertions(+), 68 deletions(-) diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog index 88e01ae6b..5e89219c0 100644 --- a/winsup/cygwin/ChangeLog +++ b/winsup/cygwin/ChangeLog @@ -1,3 +1,12 @@ +2003-09-24 Christopher Faylor + + * shared_info.h (CURR_MOUNT_MAGIC): Fix. + + * sigproc.cc (sigpacket): New structure. + (sig_send): Fill out sigpacket structure to send to signal thread + rather than racily sending separate packets. + (wait_sig): Use sigpacket structure to receive info from signal sender. + 2003-09-24 Pierre Humblet * shared_info.h (class user_info): New. diff --git a/winsup/cygwin/shared_info.h b/winsup/cygwin/shared_info.h index 02db4eb94..dadab8993 100644 --- a/winsup/cygwin/shared_info.h +++ b/winsup/cygwin/shared_info.h @@ -44,7 +44,7 @@ class mount_item #define USER_VERSION 1 // increment when mount table changes and #define USER_VERSION_MAGIC CYGWIN_VERSION_MAGIC (MOUNT_MAGIC, USER_VERSION) -#define CURR_MOUNT_MAGIC 0x4fe431cdU /* FIXME */ +#define CURR_MOUNT_MAGIC 0x6dd73a3fU class reg_key; struct device; diff --git a/winsup/cygwin/sigproc.cc b/winsup/cygwin/sigproc.cc index ba7ddec12..b616ac1c3 100644 --- a/winsup/cygwin/sigproc.cc +++ b/winsup/cygwin/sigproc.cc @@ -72,6 +72,14 @@ public: friend int __stdcall sig_dispatch_pending (); }; +struct sigpacket +{ + int sig; + pid_t pid; + HANDLE wakeup; + sigset_t *mask; +}; + static pending_signals sigqueue; struct sigaction *global_sigs; @@ -652,10 +660,10 @@ sig_send (_pinfo *p, int sig, DWORD ebp, bool exception) int rc = 1; DWORD tid = GetCurrentThreadId (); BOOL its_me; - HANDLE thiscomplete; HANDLE sendsig; bool wait_for_completion; sigframe thisframe; + sigpacket pack; if (p == myself_nowait_nonmain) p = (tid == mainthread.id) ? (_pinfo *) myself : myself_nowait; @@ -691,7 +699,7 @@ sig_send (_pinfo *p, int sig, DWORD ebp, bool exception) { if (tid == mainthread.id) thisframe.init (mainthread, ebp, exception); - thiscomplete = sigcomplete_main; + pack.wakeup = sigcomplete_main; } } else @@ -708,15 +716,26 @@ sig_send (_pinfo *p, int sig, DWORD ebp, bool exception) __seterrno (); goto out; } - thiscomplete = NULL; + pack.wakeup = NULL; } + sigset_t pending; + if (!its_me) + pack.mask = NULL; + else if (sig == __SIGPENDING) + pack.mask = &pending; + else if (sig == __SIGFLUSH || sig > 0) + pack.mask = &myself->getsigmask (); + else + pack.mask = NULL; + + pack.sig = sig; + pack.pid = myself->pid; DWORD nb; - if (!WriteFile (sendsig, &sig, sizeof (sig), &nb, NULL) || nb != sizeof (sig)) + if (!WriteFile (sendsig, &pack, sizeof (pack), &nb, NULL) || nb != sizeof (pack)) { - /* Couldn't signal the semaphore. This probably means that the - * process is exiting. - */ + /* Couldn't send to the pipe. This probably means that the + process is exiting. */ if (!its_me) { __seterrno (); @@ -733,48 +752,25 @@ sig_send (_pinfo *p, int sig, DWORD ebp, bool exception) goto out; } - /* Write completion handle or NULL */ - if (!WriteFile (sendsig, &thiscomplete, sizeof (thiscomplete), &nb, NULL) - || nb != sizeof (thiscomplete)) - { - __seterrno (); - goto out; - } - sigset_t pending; - sigset_t *mask; - if (sig == __SIGPENDING) - mask = &pending; - else if (sig == __SIGFLUSH || sig > 0) - mask = &myself->getsigmask (); - else - mask = NULL; - if (mask && !WriteFile (sendsig, &mask, sizeof (mask), &nb, NULL) - || nb != sizeof (pending)) + /* No need to wait for signal completion unless this was a signal to + this process. + + If it was a signal to this process, wait for a dispatched signal. + Otherwise just wait for the wait_sig to signal that it has finished + processing the signal. */ + if (wait_for_completion) { - __seterrno (); - goto out; + sigproc_printf ("Waiting for pack.wakeup %p", pack.wakeup); + rc = WaitForSingleObject (pack.wakeup, WSSC); } - - /* No need to wait for signal completion unless this was a signal to - * this process. - * - * If it was a signal to this process, wait for a dispatched signal. - * Otherwise just wait for the wait_sig to signal that it has finished - * processing the signal. - */ - if (!wait_for_completion) + else { rc = WAIT_OBJECT_0; sigproc_printf ("Not waiting for sigcomplete. its_me %d signal %d", its_me, sig); if (!its_me) ForceCloseHandle (sendsig); } - else - { - sigproc_printf ("Waiting for thiscomplete %p", thiscomplete); - rc = WaitForSingleObject (thiscomplete, WSSC); - } if (rc == WAIT_OBJECT_0) rc = 0; // Successful exit @@ -1088,32 +1084,29 @@ wait_sig (VOID *self) for (;;) { - int sig; DWORD nb; - if (!ReadFile (readsig, &sig, sizeof (sig), &nb, NULL)) + sigpacket pack; + if (!ReadFile (readsig, &pack, sizeof (pack), &nb, NULL)) break; - HANDLE wakeup; - if (!ReadFile (readsig, &wakeup, sizeof (wakeup), &nb, NULL) - || nb != sizeof (wakeup)) + if (nb != sizeof (pack)) { - system_printf ("signal notification handle read failure, %E"); + system_printf ("short read from signal pipe: %d != %d", nb, + sizeof (pack)); continue; } - if (!sig) + if (!pack.sig) continue; /* Just checking to see if we exist */ - sigset_t *mask; - if ((sig == __SIGFLUSH || sig == __SIGPENDING || sig > 0) - && (!ReadFile (readsig, &mask, sizeof (mask), &nb, NULL) - || nb != sizeof (mask))) + sigset_t dummy_mask; + if (!pack.mask) { - system_printf ("signal mask handle read failure, %E"); - continue; + dummy_mask = myself->getsigmask (); + pack.mask = &dummy_mask; } - switch (sig) + switch (pack.sig) { case __SIGCOMMUNE: talktome (); @@ -1122,35 +1115,35 @@ wait_sig (VOID *self) strace.hello (); continue; case __SIGPENDING: - *mask = 0; + *pack.mask = 0; unsigned bit; sigqueue.reset (); - while ((sig = sigqueue.next ())) - if (myself->getsigmask () & (bit = SIGTOMASK (sig))) - *mask |= bit; + while ((pack.sig = sigqueue.next ())) + if (myself->getsigmask () & (bit = SIGTOMASK (pack.sig))) + *pack.mask |= bit; break; default: - if (sig < 0) - sig_clear (-sig); + if (pack.sig < 0) + sig_clear (-pack.sig); else { int sh; - for (int i = 0; !(sh = sig_handle (sig, *mask)) && i < 100 ; i++) + for (int i = 0; !(sh = sig_handle (pack.sig, *pack.mask)) && i < 100 ; i++) low_priority_sleep (0); // hopefully a temporary condition if (sh <= 0) - sigqueue.add (sig); // FIXME: Shouldn't add this in !sh condition - if (sig == SIGCHLD) + sigqueue.add (pack.sig); // FIXME: Shouldn't add this in !sh condition + if (pack.sig == SIGCHLD) proc_subproc (PROC_CLEARWAIT, 0); } case __SIGFLUSH: sigqueue.reset (); - while ((sig = sigqueue.next ())) - if (sig_handle (sig, *mask) > 0) + while ((pack.sig = sigqueue.next ())) + if (sig_handle (pack.sig, *pack.mask) > 0) sigqueue.del (); break; } - if (wakeup) - SetEvent (wakeup); + if (pack.wakeup) + SetEvent (pack.wakeup); } sigproc_printf ("done"); -- 2.43.5