XInitThreads multiple times
aplattner at nvidia.com
Wed Aug 11 06:25:50 UTC 2021
On 8/5/21 8:36 AM, Keith Packard wrote:
> Dawid Kowalczyk <niexx13 at gmail.com> writes:
>> Is it possible to call |XInitThreads| multiple times, for example 20
>> times and not worry who calls it first?
> XInitThreads isn't re-entrant, so you need to ensure that it isn't
> getting invoked by multiple threads in parallel, but it does check to
> see if it has been called before, so it is safe to call multiple times
> in sequence.
Right, it's not thread-safe. From the man page:
The XInitThreads function initializes Xlib support
for concurrent threads. This function must be the
first Xlib function a multi-threaded program calls,
and **it must complete before any other Xlib call is
(emphasis mine). Looking at the code, it looks like that rule includes
other calls to XInitThreads and not just *other* Xlib functions.
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