diff -r 89d6a7a84779 -r 25a17d01db0c Symbian3/PDK/Source/GUID-6CF8A41B-C2DD-5D57-A71D-6405CE08A06B.dita --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Symbian3/PDK/Source/GUID-6CF8A41B-C2DD-5D57-A71D-6405CE08A06B.dita Fri Jan 22 18:26:19 2010 +0000 @@ -0,0 +1,36 @@ + + + + + +Using Signals to Handle Asynchronous Events

You can use signals to handle asynchronous user events. A process (program code) can send a signal to itself that can be handled asynchronously based on the signal handler registered for it. This provides a way to perform tasks in parallel without any complex thread manipulation in the program code.

The following example code demonstrates how a program code sets a signal to itself and how it handles the signal asynchronously in a signal handler:

#include <signal.h> +#include <stdio.h> +void sighandler(int signum) + { + if(signum == SIGUSR1) + { + // Code to perform custom handling + } + else if(signum == SIGUSR2) + { + // Code to perform custom handling + } + } +int main() + { + signal(SIGUSR1,sighandler); + signal(SIGUSR2,sighandler); + // program logic + raise(SIGUSR1); // indicates user event one + // program logic + raise(SIGUSR2); // indicates user event two + // program logic + return 0; + } Signal Emulation on Symbian + Platform Using Signals to Terminate Processes Using Signals to Handle Exceptions \ No newline at end of file