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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:21:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:21:29 +0000 |
commit | 29cd838eab01ed7110f3ccb2e8c6a35c8a31dbcc (patch) | |
tree | 63ef546b10a81d461e5cf5ed9e98a68cd7dee1aa /src/lib/kStuff/kProfiler2/tstlongjmp.c | |
parent | Initial commit. (diff) | |
download | kbuild-29cd838eab01ed7110f3ccb2e8c6a35c8a31dbcc.tar.xz kbuild-29cd838eab01ed7110f3ccb2e8c6a35c8a31dbcc.zip |
Adding upstream version 1:0.1.9998svn3589+dfsg.upstream/1%0.1.9998svn3589+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/lib/kStuff/kProfiler2/tstlongjmp.c')
-rw-r--r-- | src/lib/kStuff/kProfiler2/tstlongjmp.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/lib/kStuff/kProfiler2/tstlongjmp.c b/src/lib/kStuff/kProfiler2/tstlongjmp.c new file mode 100644 index 0000000..d6e2b49 --- /dev/null +++ b/src/lib/kStuff/kProfiler2/tstlongjmp.c @@ -0,0 +1,62 @@ +
+#include <setjmp.h>
+#include <time.h>
+
+/* just try trick the compiler into not optimizing stuff by
+ making it "uncertain" which path to take. */
+int always_true(void)
+{
+ time_t t = time(NULL);
+ if (t == time(NULL))
+ return 1;
+ if (t != time(NULL))
+ return 1;
+ if (t == time(NULL))
+ return 1;
+ if (t != time(NULL))
+ return 1;
+ return 0;
+}
+
+jmp_buf g_JmpBuf;
+
+int onelevel(void)
+{
+ if (always_true())
+ longjmp(g_JmpBuf, 1);
+ return 0;
+}
+
+
+int twolevels_inner(void)
+{
+ if (always_true())
+ longjmp(g_JmpBuf, 1);
+ return 0;
+}
+
+int twolevels_outer(void)
+{
+ int rc;
+ always_true();
+ rc = twolevels_inner();
+ always_true();
+ return rc;
+}
+
+
+int main()
+{
+ int rc = 1;
+
+ /* first */
+ if (!setjmp(g_JmpBuf))
+ rc = onelevel();
+
+ /* second */
+ if (!setjmp(g_JmpBuf))
+ rc = twolevels_outer();
+
+ return rc != 1;
+}
+
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