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Fix Win32 problems with signals and sockets, by making the forkexec code

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even uglier than it was already :-(.  Also, on Windows only, use temporary
shared memory segments instead of ordinary files to pass over critical
variable values from postmaster to child processes.  Magnus Hagander
This commit is contained in:
Tom Lane
2004-11-17 00:14:14 +00:00
parent e1bf6527f6
commit 0021ae06be
5 changed files with 641 additions and 265 deletions
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46
src/backend/port/win32/signal.c
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2004, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/port/win32/signal.c,v 1.9 2004/11/09 13:01:25 petere Exp $
* $PostgreSQL: pgsql/src/backend/port/win32/signal.c,v 1.10 2004/11/17 00:14:10 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -26,6 +26,7 @@ static pqsigfunc pg_signal_defaults[PG_SIGNAL_COUNT];
static int pg_signal_mask;
DLLIMPORT HANDLE pgwin32_signal_event;
HANDLE pgwin32_initial_signal_pipe = INVALID_HANDLE_VALUE;
/* Signal handling thread function */
@@ -154,6 +155,28 @@ pqsignal(int signum, pqsigfunc handler)
return prevfunc;
}
/* Create the signal listener pipe for specified pid */
HANDLE
pgwin32_create_signal_listener(pid_t pid)
{
char pipename[128];
HANDLE pipe;
wsprintf(pipename, "\\\\.\\pipe\\pgsignal_%d", (int) pid);
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)
ereport(ERROR,
(errmsg("could not create signal listener pipe for pid %d: error code %d",
(int) pid, (int) GetLastError())));
return pipe;
}
/*
* All functions below execute on the signal handler thread
* and must be synchronized as such!
@@ -210,7 +233,7 @@ static DWORD WINAPI
pg_signal_thread(LPVOID param)
{
char pipename[128];
HANDLE pipe = INVALID_HANDLE_VALUE;
HANDLE pipe = pgwin32_initial_signal_pipe;
wsprintf(pipename, "\\\\.\\pipe\\pgsignal_%d", GetCurrentProcessId());
@@ -219,14 +242,18 @@ pg_signal_thread(LPVOID param)
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)
{
write_stderr("could not create signal listener pipe: error code %d; retrying\n", (int) GetLastError());
SleepEx(500, FALSE);
continue;
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)
{
write_stderr("could not create signal listener pipe: error code %d; retrying\n", (int) GetLastError());
SleepEx(500, FALSE);
continue;
}
}
fConnected = ConnectNamedPipe(pipe, NULL) ? TRUE : (GetLastError() == ERROR_PIPE_CONNECTED);
@@ -244,6 +271,9 @@ pg_signal_thread(LPVOID param)
else
/* Connection failed. Cleanup and try again */
CloseHandle(pipe);
/* Set up so we create a new pipe on next loop */
pipe = INVALID_HANDLE_VALUE;
}
return 0;
}