lavu: add support for atomic operations.

These could be used for reference counting, or for keeping track of
decoding progress in references in multithreaded decoders.

Support is provided by gcc/msvc/suncc intrinsics, with a fallback using
pthread mutexes.

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/configure b/configure
index d9708e8227..a4b12c6b2d 100755
--- a/configure
+++ b/configure
@@ -1285,9 +1285,11 @@ HAVE_LIST="
     loongson
     machine_ioctl_bt848_h
     machine_ioctl_meteor_h
+    machine_rw_barrier
     malloc_h
     MapViewOfFile
     memalign
+    MemoryBarrier
     mkstemp
     mm_empty
     mmap
@@ -1322,6 +1324,7 @@ HAVE_LIST="
     struct_v4l2_frmivalenum_discrete
     symver_asm_label
     symver_gnu_asm
+    sync_synchronize
     sysconf
     sysctl
     sys_mman_h
@@ -3453,6 +3456,9 @@ check_func  strerror_r
 check_func  strptime
 check_func  strtok_r
 check_func  sched_getaffinity
+check_builtin sync_synchronize "" "__sync_synchronize()"
+check_builtin machine_rw_barrier mbarrier.h "__machine_rw_barrier()"
+check_builtin MemoryBarrier windows.h "MemoryBarrier()"
 check_func  sysconf
 check_func  sysctl
 check_func  usleep