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From: Jason Evans <jasone@FreeBSD.org>
Date: Tue, 18 Jan 2000 23:04:52 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/lib/libc_r/uthread uthread_jmp.c Makefile.inc
         pthread_private.h uthread_cancel.c uthread_cond.c uthread_create.c
         uthread_fd.c uthread_file.c uthread_init.c uthread_join.c
         uthread_kern.c uthread_mutex.c uthread_priority_queue.c ...
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jasone      2000/01/18 23:04:52 PST

  Modified files:
    lib/libc_r/uthread   Makefile.inc pthread_private.h 
                         uthread_cancel.c uthread_cond.c 
                         uthread_create.c uthread_fd.c 
                         uthread_file.c uthread_init.c 
                         uthread_join.c uthread_kern.c 
                         uthread_mutex.c uthread_priority_queue.c 
                         uthread_setprio.c uthread_sig.c 
  Added files:
    lib/libc_r/uthread   uthread_jmp.c 
  Log:
  Implement continuations to correctly handle [sig|_]longjmp() inside of a
  signal handler.  Explicitly check for jumps to anywhere other than the
  current stack, since such jumps are undefined according to POSIX.
  
  While we're at it, convert thread cancellation to use continuations, since
  it's cleaner than the original cancellation code.
  
  Avoid delivering a signal to a thread twice.  This was a pre-existing bug,
  but was likely unexposed until these other changes were made.
  
  Defer signals generated by pthread_kill() so that they can be delivered on
  the appropriate stack.  deischen claims that this is unnecessary, which is
  likely true, but without this change, pthread_kill() can cause undefined
  priority queue states and/or PANICs in [sig|_]longjmp(), so I'm leaving
  this in for now.  To compile this code out and exercise the bug, define
  the _NO_UNDISPATCH cpp macro.  Defining _PTHREADS_INVARIANTS as well will
  cause earlier crashes.
  
  PR:			kern/14685
  Collaboration with:	deischen
  
  Revision  Changes    Path
  1.21      +2 -1      src/lib/libc_r/uthread/Makefile.inc
  1.33      +53 -2     src/lib/libc_r/uthread/pthread_private.h
  1.3       +19 -5     src/lib/libc_r/uthread/uthread_cancel.c
  1.21      +21 -13    src/lib/libc_r/uthread/uthread_cond.c
  1.24      +27 -13    src/lib/libc_r/uthread/uthread_create.c
  1.16      +9 -17     src/lib/libc_r/uthread/uthread_fd.c
  1.12      +4 -7      src/lib/libc_r/uthread/uthread_file.c
  1.23      +13 -1     src/lib/libc_r/uthread/uthread_init.c
  1.12      +4 -6      src/lib/libc_r/uthread/uthread_join.c
  1.27      +45 -5     src/lib/libc_r/uthread/uthread_kern.c
  1.20      +4 -6      src/lib/libc_r/uthread/uthread_mutex.c
  1.5       +2 -2      src/lib/libc_r/uthread/uthread_priority_queue.c
  1.7       +1 -2      src/lib/libc_r/uthread/uthread_setprio.c
  1.24      +196 -18   src/lib/libc_r/uthread/uthread_sig.c



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