Is there any mutex/semaphore mechanism in shell scripts?

[jjjaime]

I would like to execute some functions in parallel, but the last method has
to wait until the first 2 functions have finished.

The script is:

FUNCTION_1() {
...
}
FUNCTION_2() {
...
}
FUNCTION_3() {
...
}
FUNCTION_1 &
FUNCTION_2
FUNCTION_3

So, to speed up the execution of the script, I want FUNCTION_1 and
FUNCTION_2 in parallel. But the script fails when FUNCTION_2 ends before
FUNCTION_1.

Is there any mechanism for synchronization (i.e. semaphores/mutes) or any
other suggestion for simulating it?

Thanks in advance,
Jaime
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