>No, the semantics are the same. The internal implementation may slightly >differ, I haven't looked in detail. The point is how to handle >cancellation from a cancelled thread, not how to mark a thread as being >cancelled. The hurd_thread_cancel function merely exists because there >isn't any in the cthreads package. You should be able to replace it with >pthread_cancel without further effort.
>-- >Richard Braun I don't think that the semantics are the same. From what I can tell, hurd_thread_cancel kindly informs the thread that it has been canceled and should take an appropriate action, while pthread_cancel has the thread call pthread_exit at the next cancellation point. How they mark a thread as canceled differs too: hurd cancellation is flagged within the thread's struct hurd_sigstate, while pthread cancellation is flagged within the thread's struct __pthread. Here is the declaration of hurd_thread_cancel from glibc's hurd.h: /* Cancel pending operations on THREAD. If it is doing an interruptible RPC, that RPC will now return EINTR; otherwise, the "cancelled" flag will be set, causing the next `hurd_check_cancel' call to return nonzero or the next interruptible RPC to return EINTR (whichever is called first). */ extern error_t hurd_thread_cancel (thread_t thread); Thomas D
