Does anybody ready to implement it or you want me to send the patches?
Ruslo
On 29-Oct-14 16:48, Brad King wrote:
On 10/28/2014 04:28 PM, Ruslan Baratov wrote:
What do you think about this:
Thanks for drafting the signature.
file(
LOCK <path>
[DIRECTORY] # if present locked file will be <path>/cmake.lock
(instead of <path>)
[RELEASE] # do explicit unlock
[GUARD <FUNCTION|FILE|PROCESS>] # if not present - set to `GUARD
PROCESS` (not used if RELEASE)
[RESULT_VARIABLE <variable>] # 0 on success, error message
otherwise; if not present - any error is FATAL_ERROR
[TIMEOUT <seconds>]
# 0 - return immediately if operation failed (try_lock),
otherwise timeout (timed_lock);
# if not present - lock until success (or error);
# not used if RELEASE;
)
That looks good. The TIMEOUT unit can be 'seconds' but it should
accept a floating point value to get shorter times if possible.
Boost implementation of file locking mechanism use
LockFileEx/UnlockFileEx for windows and fcntl for unix-like platforms.
These functions lock file only for current process. When process crashes
lock removed by OS automatically.
Great!
I've tried (Un)LockFileEx/fcntl on windows (including mingw and cygwin),
linux and mac - works fine for me with one exception: cygwin's lock is
not visible by win32's lock. I.e. you can synchronize multiple cygwin
processes and multiple windows "normal" processes, but you can't mix them.
Thanks for testing. The windows/cygwin mixing limitation is acceptable
IMO.
Thanks,
-Brad
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