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X11: Use lower-latency poll where available
This uses ppoll for waiting on file descriptors with a timeout, where
that function has been available a while. On NetBSD, which will be
getting ppoll in the next release, the equivalent pollts is used.
This commit is based on work by OlivierSohn and kovidgoyal.
Related to #1281
Related to #1285
(cherry picked from commit 84b0923fe6
)
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parent
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9f73e9afa3
@ -27,12 +27,18 @@
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// It is fine to use C99 in this file because it will not be built with VS
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//========================================================================
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#if defined(__linux__)
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#define _GNU_SOURCE
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#endif
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#include "internal.h"
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#include <X11/cursorfont.h>
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#include <X11/Xmd.h>
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#include <poll.h>
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#include <signal.h>
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#include <time.h>
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#include <string.h>
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#include <stdio.h>
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@ -64,10 +70,22 @@ static GLFWbool waitForData(struct pollfd* fds, nfds_t count, double* timeout)
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{
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if (timeout)
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{
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const int milliseconds = (int) (*timeout * 1e3);
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const uint64_t base = _glfwPlatformGetTimerValue();
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#if defined(__linux__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__CYGWIN__)
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const time_t seconds = (time_t) *timeout;
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const long nanoseconds = (long) ((*timeout - seconds) * 1e9);
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const struct timespec ts = { seconds, nanoseconds };
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const int result = ppoll(fds, count, &ts, NULL);
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#elif defined(__NetBSD__)
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const time_t seconds = (time_t) *timeout;
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const long nanoseconds = (long) ((*timeout - seconds) * 1e9);
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const struct timespec ts = { seconds, nanoseconds };
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const int result = pollts(fds, count, &ts, NULL);
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#else
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const int milliseconds = (int) (*timeout * 1e3);
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const int result = poll(fds, count, milliseconds);
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#endif
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const int error = errno; // clock_gettime may overwrite our error
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*timeout -= (_glfwPlatformGetTimerValue() - base) /
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