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drd/tests/atomic_var: Avoid that platform-specific code can trigger a false negative

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git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13876
This commit is contained in:
Bart Van Assche 2014-03-18 08:45:51 +00:00
parent 5e83ae1346
commit 4ce8144dee
3 changed files with 8 additions and 2 deletions
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6
drd/tests/atomic_var.c
View File

@ -23,6 +23,8 @@
has built-in functions for atomic memory access.
#endif
static pthread_barrier_t s_barrier;
static __inline__
int sync_add_and_fetch(int* p, int i)
{
@ -36,6 +38,7 @@ static int s_y = 0;
static void* thread_func_1(void* arg)
{
pthread_barrier_wait(&s_barrier);
s_y = 1;
(void) sync_add_and_fetch(&s_x, 1);
return 0;
@ -43,6 +46,7 @@ static void* thread_func_1(void* arg)
static void* thread_func_2(void* arg)
{
pthread_barrier_wait(&s_barrier);
while (sync_add_and_fetch(&s_x, 0) == 0)
;
fprintf(stderr, "y = %d\n", s_y);
@ -56,10 +60,12 @@ int main(int argc, char** argv)
pthread_t tid[n_threads];
fprintf(stderr, "Start of test.\n");
pthread_barrier_init(&s_barrier, 0, 2);
pthread_create(&tid[0], 0, thread_func_1, 0);
pthread_create(&tid[1], 0, thread_func_2, 0);
for (i = 0; i < n_threads; i++)
pthread_join(tid[i], 0);
pthread_barrier_destroy(&s_barrier);
fprintf(stderr, "Test finished.\n");
return 0;

2
drd/tests/atomic_var.stderr.exp
View File

@ -4,7 +4,7 @@ Conflicting load by thread x at 0x........ size 4
at 0x........: thread_func_2 (atomic_var.c:?)
by 0x........: vgDrd_thread_wrapper (drd_pthread_intercepts.c:?)
Location 0x........ is 0 bytes inside global var "s_y"
declared at atomic_var.c:35
declared at atomic_var.c:37
y = 1
Test finished.

2
drd/tests/atomic_var.vgtest
View File

@ -1,4 +1,4 @@
prereq: test -e atomic_var && ./supported_libpthread
vgopts: --read-var-info=yes --check-stack-var=yes --show-confl-seg=no --num-callers=2
vgopts: --fair-sched=yes --read-var-info=yes --check-stack-var=yes --show-confl-seg=no --num-callers=2
prog: atomic_var
stderr_filter: filter_stderr_and_thread_no