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commit b8b91e982ec3235a24ce052cbd8bb0e4fe1464e0
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Author: Yao Qi <yao@codesourcery.com>
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Date: Thu Jun 5 15:07:47 2014 +0800
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Fix the race in gdb.threads/staticthreads.exp
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The code in gdb.threads/staticthreads.exp about checking the value of
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tlsvar in main thread is racy, because when child thread hits
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breakpoint, the main thread may not go into pthread_join yet, and
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may not be unwind to main.
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This patch is to move the line setting breakpoint on after sem_wait,
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so that the child thread will hit breakpoint after main thread calls
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sem_post. IOW, when child thread hits breakpoint, the main thread is
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in either sem_post or pthread_join. "up 10" can unwind main thread to
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main.
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gdb/testsuite:
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2014-06-06 Yao Qi <yao@codesourcery.com>
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* gdb.threads/staticthreads.c (thread_function): Move the line
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setting breakpoint on forward.
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* gdb.threads/staticthreads.exp: Update comments.
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Message-ID: <5390387C.7050308@codesourcery.com>
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Index: gdb-7.6.1/gdb/testsuite/gdb.threads/staticthreads.c
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===================================================================
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--- gdb-7.6.1.orig/gdb/testsuite/gdb.threads/staticthreads.c
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+++ gdb-7.6.1/gdb/testsuite/gdb.threads/staticthreads.c
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@@ -38,7 +38,6 @@ thread_function (void *arg)
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#ifdef HAVE_TLS
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tlsvar = 2;
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#endif
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- printf ("Thread executing\n"); /* tlsvar-is-set */
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while (sem_wait (&semaphore) != 0)
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{
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if (errno != EINTR)
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@@ -47,6 +46,7 @@ thread_function (void *arg)
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return;
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}
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}
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+ printf ("Thread executing\n"); /* tlsvar-is-set */
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return NULL;
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}
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Index: gdb-7.6.1/gdb/testsuite/gdb.threads/staticthreads.exp
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===================================================================
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--- gdb-7.6.1.orig/gdb/testsuite/gdb.threads/staticthreads.exp
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+++ gdb-7.6.1/gdb/testsuite/gdb.threads/staticthreads.exp
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@@ -112,7 +112,7 @@ if { "$have_tls" != "" } {
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gdb_continue_to_breakpoint "tlsvar-is-set" ".* tlsvar-is-set .*"
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gdb_test "p tlsvar" " = 2" "tlsvar in thread"
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gdb_test "thread 1" ".*"
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- # Unwind from pthread_join.
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+ # Unwind to main.
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gdb_test "up 10" " in main .*"
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gdb_test "p tlsvar" " = 1" "tlsvar in main"
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}
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