C和Python之间的文件锁（flock）兼容性

Question

Does the python implementation of flock work transparently along with standard C libraries? If I have two programs, one in Python and the other in C, trying acquire a lock on a single file will it work?

Quick links:

1. Python flock: https://docs.python.org/2/library/fcntl.html
2. Linux flock: http://linux.die.net/man/2/flock

Answer 1

Python's fcntl library is built directly on top of the standard C libraries; so on Linux fcntl.flock() uses the flock C function directly .

See the source code for the fcntl module :

#ifdef HAVE_FLOCK
    Py_BEGIN_ALLOW_THREADS
    ret = flock(fd, code);
    Py_END_ALLOW_THREADS

This is clearly stated in the fcntl.flock() documentation as well:

fcntl.flock(fd, op)
Perform the lock operation op on file descriptor fd (file objects providing a fileno() method are accepted as well). See the Unix manual flock(2) for details. (On some systems, this function is emulated using fcntl() .)

So yes, it'll work.