Merge #12923: util: Pass pthread_self() to pthread_setschedparam instead of 0

b86730a util: Remove designator initializer from ScheduleBatchPriority (Wladimir J. van der Laan)
cff66e6 util: Pass pthread_self() to pthread_setschedparam instead of 0 (Wladimir J. van der Laan)

Pull request description:

  Nowhere in the man page of `pthread_setschedparam` it is mentioned that `0` is a valid value. The example uses `pthread_self()`, so should we.

  (noticed by Anthony Towns)
  Fixes #12915.

Tree-SHA512: 249e93b1ae7e3ba28de6ee6288400b91d21ca1b4ca41d82211f6c9609b62deb5ac87182c7bf08471d3a3e0c1af314c9ecd41f8ae864febe963b1de8a816dd82f

Author: laanwj

src/util.cpp

@@ -1064,8 +1064,8 @@ fs::path AbsPathForConfigVal(const fs::path& path, bool net_specific)
 int ScheduleBatchPriority(void)
 {
 #ifdef SCHED_BATCH
-    const static sched_param param{.sched_priority = 0};
-    if (int ret = pthread_setschedparam(0, SCHED_BATCH, &param)) {
+    const static sched_param param{0};
+    if (int ret = pthread_setschedparam(pthread_self(), SCHED_BATCH, &param)) {
         LogPrintf("Failed to pthread_setschedparam: %s\n", strerror(errno));
         return ret;
     }