core: use pthread_setschedparam across the board

I think I was trying to avoid introducing pthread as a dependency, but
now we are using pthread for SGI_video_sync thread anyway. Let's remove
the ifdefs.

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

src/meson.build

@@ -23,7 +23,7 @@ required_xcb_packages = [
 # Some XCB packages are here because their versioning differs (see check below).
 required_packages = [
 	'pixman-1', 'x11', 'x11-xcb', 'xcb-image', 'xcb-renderutil', 'xcb-util',
-	'xext'
+	'xext', 'threads',
 ]
 
 foreach i : required_packages
@@ -59,7 +59,7 @@ endif
 
 if get_option('opengl')
 	cflags += ['-DCONFIG_OPENGL', '-DGL_GLEXT_PROTOTYPES']
-	deps += [dependency('gl', required: true), dependency('egl', required: true), dependency('threads', required:true)]
+	deps += [dependency('gl', required: true), dependency('egl', required: true)]
 	srcs += [ 'opengl.c' ]
 endif
 
@@ -86,10 +86,6 @@ elif (host_system == 'freebsd' or host_system == 'netbsd' or
 	cflags += ['-DHAS_KQUEUE']
 endif
 
-if host_system == 'openbsd'
-	deps += [dependency('threads', required: true)]
-endif
-
 subdir('backend')
 
 picom = executable('picom', srcs, c_args: cflags,

src/picom.c

@@ -19,6 +19,7 @@
 #include <fcntl.h>
 #include <inttypes.h>
 #include <math.h>
+#include <pthread.h>
 #include <sched.h>
 #include <stddef.h>
 #include <stdio.h>
@@ -35,9 +36,6 @@
 #include <xcb/render.h>
 #include <xcb/sync.h>
 #include <xcb/xfixes.h>
-#ifdef __OpenBSD__
-#include <pthread.h>
-#endif
 
 #include <ev.h>
 #include <test.h>
@@ -2590,34 +2588,24 @@ void set_rr_scheduling(void) {
 
 	int ret;
 	struct sched_param param;
-
-#ifndef __OpenBSD__
-	ret = sched_getparam(0, &param);
-#else
 	int old_policy;
 	ret = pthread_getschedparam(pthread_self(), &old_policy, &param);
-#endif
-
 	if (ret != 0) {
 		log_debug("Failed to get old scheduling priority");
 		return;
 	}
 
 	param.sched_priority = priority;
 
-#ifndef __OpenBSD__
-	ret = sched_setscheduler(0, SCHED_RR, &param);
-#else
 	ret = pthread_setschedparam(pthread_self(), SCHED_RR, &param);
-#endif
-
 	if (ret != 0) {
 		log_info("Failed to set real-time scheduling priority to %d. Consider "
 		         "giving picom the CAP_SYS_NICE capability or equivalent "
 		         "support.",
 		         priority);
 		return;
 	}
+
 	log_info("Set real-time scheduling priority to %d", priority);
 }