i have opened a file in the thread and terminated the thread using pthread_exit() routine. Will it closes the opened files too?
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No. pthread_exit() doesn't close any open files.
It only releases thread-specific resources. File descriptors are process-wide and any file that you opened in a thread will remain opened and you'll have a resource leak if you call pthread_exit() before closing the file.
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And don't be tempted to call fcloseall() either in your thread! – bazza Mar 16 '15 at 06:59