Gentlemen,
I have seen conflicting information on the web concerning inter-process
mutexes in CYGWIN. I have seen outright statements that it is not
supported, and I have seen statements that ALL mutexes are inter-process by
default. Obviously, only one statement is currently correct.
The bottom line is that I have some shared memory and multiple processes --
basically a critical section. I need a technique to implement the critical
section, and preferably a solution that is portable.
I have tried for countless hours over the last few days before concluding
that process shared mutexes don't exist in CYGWIN despite some google
results implying they do. (I hope I am wrong, and it does support them).
Any solution that will work in CYGWIN and a Linux box would be appreciated
-- all I need is a critical section for mutliple processes.
Thank you in advance for your help!
-Drake
--- snippets for reference, in case my assumption is wrong (not actual code,
simplified cuts)
... initializing
pthread_mutexattr_init(&mattr); // create default attributes, returns no
error
pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED); // set for
inter-process sharing (it is returning EINVAL)
pthread_mutex_init(&mutex, &mattr); // init, returns no error
... locking/etc...
pthread_mutex_lock(&mutex) // returns no error in process that init'd mutex,
EINVAL in other processes
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