nanogui: Thread-safety, wrapping globals in structs, RTEMS
Subject:
Re: Thread-safety, wrapping globals in structs, RTEMS
From:
"Greg Haerr" ####@####.####
Date:
20 Dec 2000 22:13:19 -0000
Message-Id: <015101c06ad3$41566a80$6817dbd0@censoft.com>
: Call these hooks "Gr(Un)LockSomethingOrOther()" or
: "GrObtainSomeSemaphore()"... Does anyone want to name these functions
: after their favorite pet or anything like that?
Use
LOCK(mutex)
and
UNLOCK(mutex)
where LOCK and UNLOCK are #define's. In addition,
the mutex itself can be declared as a MUTEX, allowing
any different means of critical section handling routines
to be used without having to re-hack Nano-X all the time.
Since we're talking about code that's internal to Nano-X,
we won't use the GrXXX functions, since they're not allowed
to be called by users.
At this point, I'd recommend a #include "mutex.h" in serv.h,
with the
#if RTEMS_MUTEX
#include <pthread.h>
#define MUTEX pthread_mutex
#define LOCK(mutex) pthread_lock(&mutex)
#endif
etc
or whatever in mutex.h.
Then, a single global mutex can be used in each GrXXX routine
to guarantee thread safety.
Regards,
Greg
