MINOR: threads: mark all_threads_mask as read_mostly
This variable almost never changes and is read a lot in time-critical
sections. threads_want_rdv_mask is read very often as well in
thread_harmless_end() and is almost never changed (only when someone
uses thread_isolate()). Let's move both to read_mostly.
diff --git a/src/thread.c b/src/thread.c
index 93a5294..742e47c 100644
--- a/src/thread.c
+++ b/src/thread.c
@@ -34,10 +34,10 @@
#ifdef USE_THREAD
-volatile unsigned long threads_want_rdv_mask = 0;
+volatile unsigned long threads_want_rdv_mask __read_mostly = 0;
volatile unsigned long threads_harmless_mask = 0;
volatile unsigned long threads_sync_mask = 0;
-volatile unsigned long all_threads_mask = 1; // nbthread 1 assumed by default
+volatile unsigned long all_threads_mask __read_mostly = 1; // nbthread 1 assumed by default
THREAD_LOCAL unsigned int tid = 0;
THREAD_LOCAL unsigned long tid_bit = (1UL << 0);
int thread_cpus_enabled_at_boot = 1;