qemu/atomic.h: rename atomic_ to qatomic_

clang's C11 atomic_fetch_*() functions only take a C11 atomic type
pointer argument. QEMU uses direct types (int, etc) and this causes a
compiler error when a QEMU code calls these functions in a source file
that also included <stdatomic.h> via a system header file:

  $ CC=clang CXX=clang++ ./configure ... && make
  ../util/async.c:79:17: error: address argument to atomic operation must be a pointer to _Atomic type ('unsigned int *' invalid)

Avoid using atomic_*() names in QEMU's atomic.h since that namespace is
used by <stdatomic.h>. Prefix QEMU's APIs with 'q' so that atomic.h
and <stdatomic.h> can co-exist. I checked /usr/include on my machine and
searched GitHub for existing "qatomic_" users but there seem to be none.

This patch was generated using:

  $ git grep -h -o '\<atomic\(64\)\?_[a-z0-9_]\+' include/qemu/atomic.h | \
    sort -u >/tmp/changed_identifiers
  $ for identifier in $(</tmp/changed_identifiers); do
        sed -i "s%\<$identifier\>%q$identifier%g" \
            $(git grep -I -l "\<$identifier\>")
    done

I manually fixed line-wrap issues and misaligned rST tables.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200923105646.47864-1-stefanha@redhat.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/util/qemu-timer.c b/util/qemu-timer.c
index 878d80fd5e..ca677836cb 100644
--- a/util/qemu-timer.c
+++ b/util/qemu-timer.c
@@ -170,7 +170,7 @@ void qemu_clock_enable(QEMUClockType type, bool enabled)
 
 bool timerlist_has_timers(QEMUTimerList *timer_list)
 {
-    return !!atomic_read(&timer_list->active_timers);
+    return !!qatomic_read(&timer_list->active_timers);
 }
 
 bool qemu_clock_has_timers(QEMUClockType type)
@@ -183,7 +183,7 @@ bool timerlist_expired(QEMUTimerList *timer_list)
 {
     int64_t expire_time;
 
-    if (!atomic_read(&timer_list->active_timers)) {
+    if (!qatomic_read(&timer_list->active_timers)) {
         return false;
     }
 
@@ -213,7 +213,7 @@ int64_t timerlist_deadline_ns(QEMUTimerList *timer_list)
     int64_t delta;
     int64_t expire_time;
 
-    if (!atomic_read(&timer_list->active_timers)) {
+    if (!qatomic_read(&timer_list->active_timers)) {
         return -1;
     }
 
@@ -385,7 +385,7 @@ static void timer_del_locked(QEMUTimerList *timer_list, QEMUTimer *ts)
         if (!t)
             break;
         if (t == ts) {
-            atomic_set(pt, t->next);
+            qatomic_set(pt, t->next);
             break;
         }
         pt = &t->next;
@@ -408,7 +408,7 @@ static bool timer_mod_ns_locked(QEMUTimerList *timer_list,
     }
     ts->expire_time = MAX(expire_time, 0);
     ts->next = *pt;
-    atomic_set(pt, ts);
+    qatomic_set(pt, ts);
 
     return pt == &timer_list->active_timers;
 }
@@ -502,7 +502,7 @@ bool timerlist_run_timers(QEMUTimerList *timer_list)
     QEMUTimerCB *cb;
     void *opaque;
 
-    if (!atomic_read(&timer_list->active_timers)) {
+    if (!qatomic_read(&timer_list->active_timers)) {
         return false;
     }