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Interprocess synchronization using signals in c, linux

Process Forks are spoken by 4 child processes. exec () is used to replace code for children. Children are initialized and must wait until the parent creates all of 4 of them.

The parent then sends sigusr1 to each child process to begin processing. A parent waits for all children to complete the process. When the child finishes its work, it sends sigusr2 to the parent element. When the parent receives all sigusr2 signals, it continues execution, merging the calculations of the child processes.

This is an exercise at the university, and in the class it was indicated that process A (parent) will lose some signals, so we were told that only the percentage signal of the children’s signals that would be received successfully is required.

I would like to reach 100%. Otherwise, is it a pause (), and the loop will work?

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If you use the standard method signal(), process A may lose some signals if many children send it the same signal in a very short time. If you process the signal and get the same thing during this time, you will lose the second (more precisely, it will be caught by the default signal handler).

If you decide to use sigaction(), you will be able to catch all the signals sent to your process.

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You must use sigaction(); however, you may lose some of them because:

. SIGUSR2, , .

- sigqueue().

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, , - , . ( !), , , , fifo eventfd.

, pipe eventfd, ? , , , pipe/eventfd , .

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You will use the alrm signal and pause in the parent process, which wait while the child process generates an alarm that issues a pause request and synchronizes them.

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