|  | 
 | # Copyright (C) Igor Sysoev | 
 | # Copyright (C) Nginx, Inc. | 
 |  | 
 |  | 
 | if [ $NGX_LIBATOMIC != YES ]; then | 
 |  | 
 |     have=NGX_HAVE_LIBATOMIC . auto/have | 
 |     CORE_INCS="$CORE_INCS $NGX_LIBATOMIC/src" | 
 |     LINK_DEPS="$LINK_DEPS $NGX_LIBATOMIC/src/libatomic_ops.a" | 
 |     CORE_LIBS="$CORE_LIBS $NGX_LIBATOMIC/src/libatomic_ops.a" | 
 |  | 
 | else | 
 |  | 
 |     ngx_feature="atomic_ops library" | 
 |     ngx_feature_name=NGX_HAVE_LIBATOMIC | 
 |     ngx_feature_run=yes | 
 |     ngx_feature_incs="#define AO_REQUIRE_CAS | 
 |                       #include <atomic_ops.h>" | 
 |     ngx_feature_path= | 
 |     ngx_feature_libs="-latomic_ops" | 
 |     ngx_feature_test="long  n = 0; | 
 |                       if (!AO_compare_and_swap(&n, 0, 1)) | 
 |                           return 1; | 
 |                       if (AO_fetch_and_add(&n, 1) != 1) | 
 |                           return 1; | 
 |                       if (n != 2) | 
 |                           return 1; | 
 |                       AO_nop();" | 
 |     . auto/feature | 
 |  | 
 |     if [ $ngx_found = yes ]; then | 
 |         CORE_LIBS="$CORE_LIBS $ngx_feature_libs" | 
 |     else | 
 |  | 
 | cat << END | 
 |  | 
 | $0: error: libatomic_ops library was not found. | 
 |  | 
 | END | 
 |         exit 1 | 
 |     fi | 
 | fi |