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Substantial rewrite of async.c to avoid problems with non-reentrant stdio

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and possibly other problems.  Minor changes in xact.c and postgres.c's
main loop to support new handling of async NOTIFY.
This commit is contained in:
Tom Lane
1998-10-06 02:40:09 +00:00
parent e7e027a6c9
commit c77a29a14e
7 changed files with 651 additions and 517 deletions
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25
src/backend/tcop/postgres.c
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.90 1998/10/02 01:14:14 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/tcop/postgres.c,v 1.91 1998/10/06 02:40:01 tgl Exp $
*
* NOTES
* this is the "main" module of the postgres backend and
@ -1511,7 +1511,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
if (!IsUnderPostmaster)
{
puts("\nPOSTGRES backend interactive interface ");
puts("$Revision: 1.90 $ $Date: 1998/10/02 01:14:14 $\n");
puts("$Revision: 1.91 $ $Date: 1998/10/06 02:40:01 $\n");
}
/* ----------------
@ -1559,7 +1559,16 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
ReadyForQuery(whereToSendOutput);
/* ----------------
* (2) read a command.
* (2) deal with pending asynchronous NOTIFY from other backends,
* and enable async.c's signal handler to execute NOTIFY directly.
* ----------------
*/
QueryCancel = false; /* forget any earlier CANCEL signal */
EnableNotifyInterrupt();
/* ----------------
* (3) read a command.
* ----------------
*/
MemSet(parser_input, 0, MAX_PARSE_BUFFER);
@ -1569,7 +1578,13 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
QueryCancel = false; /* forget any earlier CANCEL signal */
/* ----------------
* (3) process the command.
* (4) disable async.c's signal handler.
* ----------------
*/
DisableNotifyInterrupt();
/* ----------------
* (5) process the command.
* ----------------
*/
switch (firstchar)
@ -1640,7 +1655,7 @@ PostgresMain(int argc, char *argv[], int real_argc, char *real_argv[])
}
/* ----------------
* (4) commit the current transaction
* (6) commit the current transaction
*
* Note: if we had an empty input buffer, then we didn't
* call pg_exec_query, so we don't bother to commit this transaction.