*
*
* IDENTIFICATION
- * $PostgreSQL: pgsql/src/backend/libpq/pqsignal.c,v 1.29 2004/01/27 00:45:26 momjian Exp $
+ * $PostgreSQL: pgsql/src/backend/libpq/pqsignal.c,v 1.30 2004/01/27 00:46:58 momjian Exp $
*
* NOTES
* This shouldn't be in libpq, but the monitor and some other
/* pg_signal_crit_sec is used to protect only pg_signal_queue. That is the only
* variable that can be accessed from the signal sending threads! */
static CRITICAL_SECTION pg_signal_crit_sec;
-static int pg_signal_queue;
+static int pg_signal_queue;
#define PG_SIGNAL_COUNT 32
static pqsigfunc pg_signal_array[PG_SIGNAL_COUNT];
static pqsigfunc pg_signal_defaults[PG_SIGNAL_COUNT];
-static int pg_signal_mask;
+static int pg_signal_mask;
-HANDLE pgwin32_main_thread_handle;
+HANDLE pgwin32_main_thread_handle;
/* Signal handling thread function */
static DWORD WINAPI pg_signal_thread(LPVOID param);
/* Initialization */
-void pgwin32_signal_initialize(void) {
- int i;
- HANDLE signal_thread_handle;
- InitializeCriticalSection(&pg_signal_crit_sec);
-
- for (i = 0; i < PG_SIGNAL_COUNT; i++) {
- pg_signal_array[i] = SIG_DFL;
- pg_signal_defaults[i] = SIG_IGN;
- }
- pg_signal_mask = 0;
- pg_signal_queue = 0;
-
- /* Get handle to main thread so we can post calls to it later */
- if (!DuplicateHandle(GetCurrentProcess(),GetCurrentThread(),
- GetCurrentProcess(),&pgwin32_main_thread_handle,
- 0,FALSE,DUPLICATE_SAME_ACCESS)) {
- fprintf(stderr,gettext("Failed to get main thread handle!\n"));
- exit(1);
- }
-
- /* Create thread for handling signals */
- signal_thread_handle = CreateThread(NULL,0,pg_signal_thread,NULL,0,NULL);
- if (signal_thread_handle == NULL) {
- fprintf(stderr,gettext("Failed to create signal handler thread!\n"));
- exit(1);
- }
+void
+pgwin32_signal_initialize(void)
+{
+ int i;
+ HANDLE signal_thread_handle;
+
+ InitializeCriticalSection(&pg_signal_crit_sec);
+
+ for (i = 0; i < PG_SIGNAL_COUNT; i++)
+ {
+ pg_signal_array[i] = SIG_DFL;
+ pg_signal_defaults[i] = SIG_IGN;
+ }
+ pg_signal_mask = 0;
+ pg_signal_queue = 0;
+
+ /* Get handle to main thread so we can post calls to it later */
+ if (!DuplicateHandle(GetCurrentProcess(), GetCurrentThread(),
+ GetCurrentProcess(), &pgwin32_main_thread_handle,
+ 0, FALSE, DUPLICATE_SAME_ACCESS))
+ {
+ fprintf(stderr, gettext("Failed to get main thread handle!\n"));
+ exit(1);
+ }
+
+ /* Create thread for handling signals */
+ signal_thread_handle = CreateThread(NULL, 0, pg_signal_thread, NULL, 0, NULL);
+ if (signal_thread_handle == NULL)
+ {
+ fprintf(stderr, gettext("Failed to create signal handler thread!\n"));
+ exit(1);
+ }
}
-/* Dispatch all signals currently queued and not blocked
+/* Dispatch all signals currently queued and not blocked
* Blocked signals are ignored, and will be fired at the time of
* the sigsetmask() call. */
-static void dispatch_queued_signals(void) {
- int i;
-
- EnterCriticalSection(&pg_signal_crit_sec);
- while (pg_signal_queue & ~pg_signal_mask) {
- /* One or more unblocked signals queued for execution */
-
- int exec_mask = pg_signal_queue & ~pg_signal_mask;
-
- for (i = 0; i < PG_SIGNAL_COUNT; i++) {
- if (exec_mask & sigmask(i)) {
- /* Execute this signal */
- pqsigfunc sig = pg_signal_array[i];
- if (sig == SIG_DFL)
- sig = pg_signal_defaults[i];
- pg_signal_queue &= ~sigmask(i);
- if (sig != SIG_ERR && sig != SIG_IGN && sig != SIG_DFL) {
- LeaveCriticalSection(&pg_signal_crit_sec);
- sig(i);
- EnterCriticalSection(&pg_signal_crit_sec);
- break; /* Restart outer loop, in case signal mask or queue
- has been modified inside signal handler */
+static void
+dispatch_queued_signals(void)
+{
+ int i;
+
+ EnterCriticalSection(&pg_signal_crit_sec);
+ while (pg_signal_queue & ~pg_signal_mask)
+ {
+ /* One or more unblocked signals queued for execution */
+
+ int exec_mask = pg_signal_queue & ~pg_signal_mask;
+
+ for (i = 0; i < PG_SIGNAL_COUNT; i++)
+ {
+ if (exec_mask & sigmask(i))
+ {
+ /* Execute this signal */
+ pqsigfunc sig = pg_signal_array[i];
+
+ if (sig == SIG_DFL)
+ sig = pg_signal_defaults[i];
+ pg_signal_queue &= ~sigmask(i);
+ if (sig != SIG_ERR && sig != SIG_IGN && sig != SIG_DFL)
+ {
+ LeaveCriticalSection(&pg_signal_crit_sec);
+ sig(i);
+ EnterCriticalSection(&pg_signal_crit_sec);
+ break; /* Restart outer loop, in case signal mask
+ * or queue has been modified inside
+ * signal handler */
+ }
+ }
+ }
}
- }
- }
- }
- LeaveCriticalSection(&pg_signal_crit_sec);
+ LeaveCriticalSection(&pg_signal_crit_sec);
}
/* signal masking. Only called on main thread, no sync required */
-int pqsigsetmask(int mask) {
- int prevmask;
- prevmask = pg_signal_mask;
- pg_signal_mask = mask;
-
- /* Dispatch any signals queued up right away, in case we have
- unblocked one or more signals previously queued */
- dispatch_queued_signals();
-
- return prevmask;
+int
+pqsigsetmask(int mask)
+{
+ int prevmask;
+
+ prevmask = pg_signal_mask;
+ pg_signal_mask = mask;
+
+ /*
+ * Dispatch any signals queued up right away, in case we have
+ * unblocked one or more signals previously queued
+ */
+ dispatch_queued_signals();
+
+ return prevmask;
}
/* signal manipulation. Only called on main thread, no sync required */
-pqsigfunc pqsignal(int signum, pqsigfunc handler) {
- pqsigfunc prevfunc;
- if (signum >= PG_SIGNAL_COUNT || signum < 0)
- return SIG_ERR;
- prevfunc = pg_signal_array[signum];
- pg_signal_array[signum] = handler;
- return prevfunc;
+pqsigfunc
+pqsignal(int signum, pqsigfunc handler)
+{
+ pqsigfunc prevfunc;
+
+ if (signum >= PG_SIGNAL_COUNT || signum < 0)
+ return SIG_ERR;
+ prevfunc = pg_signal_array[signum];
+ pg_signal_array[signum] = handler;
+ return prevfunc;
}
/* signal sending */
-int pqkill(int pid, int sig) {
- char pipename[128];
- BYTE sigData = sig;
- BYTE sigRet = 0;
- DWORD bytes;
-
- if (sig >= PG_SIGNAL_COUNT || sig <= 0) {
- errno = EINVAL;
- return -1;
- }
- if (pid <= 0) {
- /* No support for process groups */
- errno = EINVAL;
- return -1;
- }
- wsprintf(pipename,"\\\\.\\pipe\\pgsignal_%i",pid);
- if (!CallNamedPipe(pipename,&sigData,1,&sigRet,1,&bytes,1000)) {
- if (GetLastError() == ERROR_FILE_NOT_FOUND)
- errno = ESRCH;
- else if (GetLastError() == ERROR_ACCESS_DENIED)
- errno = EPERM;
- else
- errno = EINVAL;
- return -1;
- }
- if (bytes != 1 || sigRet != sig) {
- errno = ESRCH;
- return -1;
- }
-
- return 0;
+int
+pqkill(int pid, int sig)
+{
+ char pipename[128];
+ BYTE sigData = sig;
+ BYTE sigRet = 0;
+ DWORD bytes;
+
+ if (sig >= PG_SIGNAL_COUNT || sig <= 0)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ if (pid <= 0)
+ {
+ /* No support for process groups */
+ errno = EINVAL;
+ return -1;
+ }
+ wsprintf(pipename, "\\\\.\\pipe\\pgsignal_%i", pid);
+ if (!CallNamedPipe(pipename, &sigData, 1, &sigRet, 1, &bytes, 1000))
+ {
+ if (GetLastError() == ERROR_FILE_NOT_FOUND)
+ errno = ESRCH;
+ else if (GetLastError() == ERROR_ACCESS_DENIED)
+ errno = EPERM;
+ else
+ errno = EINVAL;
+ return -1;
+ }
+ if (bytes != 1 || sigRet != sig)
+ {
+ errno = ESRCH;
+ return -1;
+ }
+
+ return 0;
}
/* APC callback scheduled on main thread when signals are fired */
-static void CALLBACK pg_signal_apc(ULONG_PTR param) {
- dispatch_queued_signals();
+static void CALLBACK
+pg_signal_apc(ULONG_PTR param)
+{
+ dispatch_queued_signals();
}
/*
*/
-static void pg_queue_signal(int signum) {
- if (signum >= PG_SIGNAL_COUNT || signum < 0)
- return;
-
- EnterCriticalSection(&pg_signal_crit_sec);
- pg_signal_queue |= sigmask(signum);
- LeaveCriticalSection(&pg_signal_crit_sec);
-
- QueueUserAPC(pg_signal_apc,pgwin32_main_thread_handle,(ULONG_PTR)NULL);
+static void
+pg_queue_signal(int signum)
+{
+ if (signum >= PG_SIGNAL_COUNT || signum < 0)
+ return;
+
+ EnterCriticalSection(&pg_signal_crit_sec);
+ pg_signal_queue |= sigmask(signum);
+ LeaveCriticalSection(&pg_signal_crit_sec);
+
+ QueueUserAPC(pg_signal_apc, pgwin32_main_thread_handle, (ULONG_PTR) NULL);
}
/* Signal dispatching thread */
-static DWORD WINAPI pg_signal_dispatch_thread(LPVOID param) {
- HANDLE pipe = (HANDLE)param;
- BYTE sigNum;
- DWORD bytes;
-
- if (!ReadFile(pipe,&sigNum,1,&bytes,NULL)) {
- /* Client died before sending */
- CloseHandle(pipe);
- return 0;
- }
- if (bytes != 1) {
- /* Received <bytes> bytes over signal pipe (should be 1) */
- CloseHandle(pipe);
- return 0;
- }
- WriteFile(pipe,&sigNum,1,&bytes,NULL); /* Don't care if it works or not.. */
- FlushFileBuffers(pipe);
- DisconnectNamedPipe(pipe);
- CloseHandle(pipe);
-
- pg_queue_signal(sigNum);
- return 0;
+static DWORD WINAPI
+pg_signal_dispatch_thread(LPVOID param)
+{
+ HANDLE pipe = (HANDLE) param;
+ BYTE sigNum;
+ DWORD bytes;
+
+ if (!ReadFile(pipe, &sigNum, 1, &bytes, NULL))
+ {
+ /* Client died before sending */
+ CloseHandle(pipe);
+ return 0;
+ }
+ if (bytes != 1)
+ {
+ /* Received <bytes> bytes over signal pipe (should be 1) */
+ CloseHandle(pipe);
+ return 0;
+ }
+ WriteFile(pipe, &sigNum, 1, &bytes, NULL); /* Don't care if it works
+ * or not.. */
+ FlushFileBuffers(pipe);
+ DisconnectNamedPipe(pipe);
+ CloseHandle(pipe);
+
+ pg_queue_signal(sigNum);
+ return 0;
}
/* Signal handling thread */
-static DWORD WINAPI pg_signal_thread(LPVOID param) {
- char pipename[128];
- HANDLE pipe = INVALID_HANDLE_VALUE;
-
- wsprintf(pipename,"\\\\.\\pipe\\pgsignal_%i",GetCurrentProcessId());
-
- for (;;) {
- BOOL fConnected;
- HANDLE hThread;
-
- pipe = CreateNamedPipe(pipename,PIPE_ACCESS_DUPLEX,
- PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,
- PIPE_UNLIMITED_INSTANCES,16,16,1000,NULL);
- if (pipe == INVALID_HANDLE_VALUE) {
- fprintf(stderr,gettext("Failed to create signal listener pipe: %i. Retrying.\n"),(int)GetLastError());
- SleepEx(500,TRUE);
- continue;
- }
-
- fConnected = ConnectNamedPipe(pipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
- if (fConnected) {
- hThread = CreateThread(NULL, 0,
- (LPTHREAD_START_ROUTINE)pg_signal_dispatch_thread,
- (LPVOID)pipe,0,NULL);
- if (hThread == INVALID_HANDLE_VALUE) {
- fprintf(stderr,gettext("Failed to create signal dispatch thread: %i\n"),(int)GetLastError());
- }
- else
- CloseHandle(hThread);
- }
- else
- /* Connection failed. Cleanup and try again */
- CloseHandle(pipe);
- }
- return 0;
+static DWORD WINAPI
+pg_signal_thread(LPVOID param)
+{
+ char pipename[128];
+ HANDLE pipe = INVALID_HANDLE_VALUE;
+
+ wsprintf(pipename, "\\\\.\\pipe\\pgsignal_%i", GetCurrentProcessId());
+
+ for (;;)
+ {
+ BOOL fConnected;
+ HANDLE hThread;
+
+ pipe = CreateNamedPipe(pipename, PIPE_ACCESS_DUPLEX,
+ PIPE_TYPE_MESSAGE | PIPE_READMODE_MESSAGE | PIPE_WAIT,
+ PIPE_UNLIMITED_INSTANCES, 16, 16, 1000, NULL);
+ if (pipe == INVALID_HANDLE_VALUE)
+ {
+ fprintf(stderr, gettext("Failed to create signal listener pipe: %i. Retrying.\n"), (int) GetLastError());
+ SleepEx(500, TRUE);
+ continue;
+ }
+
+ fConnected = ConnectNamedPipe(pipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
+ if (fConnected)
+ {
+ hThread = CreateThread(NULL, 0,
+ (LPTHREAD_START_ROUTINE) pg_signal_dispatch_thread,
+ (LPVOID) pipe, 0, NULL);
+ if (hThread == INVALID_HANDLE_VALUE)
+ fprintf(stderr, gettext("Failed to create signal dispatch thread: %i\n"), (int) GetLastError());
+ else
+ CloseHandle(hThread);
+ }
+ else
+ /* Connection failed. Cleanup and try again */
+ CloseHandle(pipe);
+ }
+ return 0;
}
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