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, 2 insertions, 2 deletions

diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index 99ce2fd5e6..de4bf7616e 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -395,7 +395,7 @@ static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
     memset(&ai, 0, sizeof(ai));
 
     ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
-    if (atomic_read(&useV4Mapped)) {
+    if (qatomic_read(&useV4Mapped)) {
         ai.ai_flags |= AI_V4MAPPED;
     }
     ai.ai_family = inet_ai_family_from_address(saddr, &err);
@@ -421,7 +421,7 @@ static struct addrinfo *inet_parse_connect_saddr(InetSocketAddress *saddr,
      */
     if (rc == EAI_BADFLAGS &&
         (ai.ai_flags & AI_V4MAPPED)) {
-        atomic_set(&useV4Mapped, 0);
+        qatomic_set(&useV4Mapped, 0);
         ai.ai_flags &= ~AI_V4MAPPED;
         rc = getaddrinfo(saddr->host, saddr->port, &ai, &res);
     }