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, 9 insertions, 9 deletions

diff --git a/audio/jackaudio.c b/audio/jackaudio.c
index 72ed7c4929..1e714b30bc 100644
--- a/audio/jackaudio.c
+++ b/audio/jackaudio.c
@@ -104,7 +104,7 @@ static void qjack_buffer_create(QJackBuffer *buffer, int channels, int frames)
 static void qjack_buffer_clear(QJackBuffer *buffer)
 {
     assert(buffer->data);
-    atomic_store_release(&buffer->used, 0);
+    qatomic_store_release(&buffer->used, 0);
     buffer->rptr = 0;
     buffer->wptr = 0;
 }
@@ -129,7 +129,7 @@ static int qjack_buffer_write(QJackBuffer *buffer, float *data, int size)
     assert(buffer->data);
     const int samples = size / sizeof(float);
     int frames        = samples / buffer->channels;
-    const int avail   = buffer->frames - atomic_load_acquire(&buffer->used);
+    const int avail   = buffer->frames - qatomic_load_acquire(&buffer->used);
 
     if (frames > avail) {
         frames = avail;
@@ -153,7 +153,7 @@ static int qjack_buffer_write(QJackBuffer *buffer, float *data, int size)
 
     buffer->wptr = wptr;
 
-    atomic_add(&buffer->used, frames);
+    qatomic_add(&buffer->used, frames);
     return frames * buffer->channels * sizeof(float);
 };
 
@@ -161,7 +161,7 @@ static int qjack_buffer_write(QJackBuffer *buffer, float *data, int size)
 static int qjack_buffer_write_l(QJackBuffer *buffer, float **dest, int frames)
 {
     assert(buffer->data);
-    const int avail   = buffer->frames - atomic_load_acquire(&buffer->used);
+    const int avail   = buffer->frames - qatomic_load_acquire(&buffer->used);
     int wptr = buffer->wptr;
 
     if (frames > avail) {
@@ -185,7 +185,7 @@ static int qjack_buffer_write_l(QJackBuffer *buffer, float **dest, int frames)
     }
     buffer->wptr = wptr;
 
-    atomic_add(&buffer->used, frames);
+    qatomic_add(&buffer->used, frames);
     return frames;
 }
 
@@ -195,7 +195,7 @@ static int qjack_buffer_read(QJackBuffer *buffer, float *dest, int size)
     assert(buffer->data);
     const int samples = size / sizeof(float);
     int frames        = samples / buffer->channels;
-    const int avail   = atomic_load_acquire(&buffer->used);
+    const int avail   = qatomic_load_acquire(&buffer->used);
 
     if (frames > avail) {
         frames = avail;
@@ -219,7 +219,7 @@ static int qjack_buffer_read(QJackBuffer *buffer, float *dest, int size)
 
     buffer->rptr = rptr;
 
-    atomic_sub(&buffer->used, frames);
+    qatomic_sub(&buffer->used, frames);
     return frames * buffer->channels * sizeof(float);
 }
 
@@ -228,7 +228,7 @@ static int qjack_buffer_read_l(QJackBuffer *buffer, float **dest, int frames)
 {
     assert(buffer->data);
     int copy       = frames;
-    const int used = atomic_load_acquire(&buffer->used);
+    const int used = qatomic_load_acquire(&buffer->used);
     int rptr       = buffer->rptr;
 
     if (copy > used) {
@@ -252,7 +252,7 @@ static int qjack_buffer_read_l(QJackBuffer *buffer, float **dest, int frames)
     }
     buffer->rptr = rptr;
 
-    atomic_sub(&buffer->used, copy);
+    qatomic_sub(&buffer->used, copy);
     return copy;
 }