------- Comment #16 from singler at kit dot edu 2010-01-15 14:29 ------- First, let's remove superfluous #pragma omp single in two occurences, to make things simpler (see attached patch for trunk). The problem still persists, the program deadlocks.
When dropping in some prints (see attached patch), the log ends like this: find going parallel, requesting 2 thread thread 0 of 2 starts thread 0 finished thread 1 of 2 starts thread 1 finished successful join find going parallel, requesting 2 thread thread 0 of 2 starts thread 0 finished Analysis: Thread 1 never starts (or at least does not reach the first printf). In general, for more threads, only thread 0 starts. This obviously leads to the deadlock. So on first sight, I would blame it on the OpenMP implementation. Maybe yet some interference with the pthreads. Any other explanations? -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42624
