05-29-2009
Program execution order like FIFO queue
Hi all:
I have a problem with a C++ service runing on solaris 10. This service only set a signal on oracle table. When the service detect a cut off on the line (tcp/ip), trigger a cobol program for set the signal OFF. When the line is on again, the service trigger the same cobol program for set the signal ON.
This service and program work fine, except when a micro cut occurs. In this scenario, the actions are:
Signal on oracle table is initialized: ON.
Micro cut occurs:
The service trigger a cobol program setting the signal to OFF
The line is ON again:
The service trigger a cobol program setting the signal to ON
But for some reason, the cobol program for set to ON the signal run first (or finish first?) that the cobol program for set to OFF the signal, like show this log:
08:55:044 - Signal set to ON
12:05:011 - Signal set to ON
12:05:012 - Signal set to OFF
Before change the code of my programs, any suggestions about how I take the control of the program execution order?
Thanks in advance
Hernán Castellani
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pause(2) System Calls pause(2)
NAME
pause - suspend process until signal
SYNOPSIS
#include <unistd.h>
int pause(void);
DESCRIPTION
The pause() function suspends the calling process until it receives a signal. The signal must be one that is not currently set to be
ignored by the calling process.
If the signal causes termination of the calling process, pause() does not return.
If the signal is caught by the calling process and control is returned from the signal-catching function (see signal(3C)), the calling
process resumes execution from the point of suspension.
RETURN VALUES
Since pause() suspends thread execution indefinitely unless interrupted by a signal, there is no successful completion return value. If
interrupted, it returns -1 and sets errno to indicate the error.
ERRORS
The pause() function will fail if:
EINTR A signal is caught by the calling process and control is returned from the signal-catching function.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO
alarm(2), kill(2), signal(3C), wait(3C), attributes(5), standards(5)
SunOS 5.10 28 Dec 1996 pause(2)