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qemu/atomic.h: rename atomic_ to qatomic_

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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>
This commit is contained in:
Stefan Hajnoczi 2020-09-23 11:56:46 +01:00
parent ed7db34b5a
commit d73415a315
133 changed files with 1041 additions and 1018 deletions
Download patch file Download diff file Expand all files Collapse all files

12
util/qemu-thread-win32.c
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@ -250,8 +250,8 @@ void qemu_event_set(QemuEvent *ev)
* ev->value we need a full memory barrier here.
*/
smp_mb();
if (atomic_read(&ev->value) != EV_SET) {
if (atomic_xchg(&ev->value, EV_SET) == EV_BUSY) {
if (qatomic_read(&ev->value) != EV_SET) {
if (qatomic_xchg(&ev->value, EV_SET) == EV_BUSY) {
/* There were waiters, wake them up. */
SetEvent(ev->event);
}
@ -263,13 +263,13 @@ void qemu_event_reset(QemuEvent *ev)
unsigned value;
assert(ev->initialized);
value = atomic_read(&ev->value);
value = qatomic_read(&ev->value);
smp_mb_acquire();
if (value == EV_SET) {
/* If there was a concurrent reset (or even reset+wait),
* do nothing. Otherwise change EV_SET->EV_FREE.
*/
atomic_or(&ev->value, EV_FREE);
qatomic_or(&ev->value, EV_FREE);
}
}
@ -278,7 +278,7 @@ void qemu_event_wait(QemuEvent *ev)
unsigned value;
assert(ev->initialized);
value = atomic_read(&ev->value);
value = qatomic_read(&ev->value);
smp_mb_acquire();
if (value != EV_SET) {
if (value == EV_FREE) {
@ -292,7 +292,7 @@ void qemu_event_wait(QemuEvent *ev)
* because there cannot be a concurrent busy->free transition.
* After the CAS, the event will be either set or busy.
*/
if (atomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) {
if (qatomic_cmpxchg(&ev->value, EV_FREE, EV_BUSY) == EV_SET) {
value = EV_SET;
} else {
value = EV_BUSY;