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Hurd: make sigstates hold a reference on thread ports
This change is required in order to correctly release per-thread resources. Directly reusing the threading library reference isn't possible since the sigstate is also used early in the main thread, before threading is initialized. * hurd/hurd/signal.h (_hurd_self_sigstate): Drop thread reference after calling _hurd_thread_sigstate. (_hurd_critical_section_lock): Likewise. * hurd/hurdsig.c (_hurd_thread_sigstate): Add a reference on the thread. (_hurd_sigstate_delete): Drop thread reference.
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@ -67,7 +67,9 @@ struct hurd_sigstate
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spin_lock_t lock; /* Locks most of the rest of the structure. */
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/* The signal state holds a reference on the thread port. */
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thread_t thread;
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struct hurd_sigstate *next; /* Linked-list of thread sigstates. */
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sigset_t blocked; /* What signals are blocked. */
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@ -119,7 +121,9 @@ struct hurd_sigstate
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extern struct hurd_sigstate *_hurd_sigstates;
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/* Get the sigstate of a given thread, taking its lock. */
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/* Get the sigstate of a given thread. If there was no sigstate for
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the thread, one is created, and the thread gains a reference. If
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the given thread is MACH_PORT_NULL, return the global sigstate. */
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extern struct hurd_sigstate *_hurd_thread_sigstate (thread_t);
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@ -162,7 +166,11 @@ _HURD_SIGNAL_H_EXTERN_INLINE struct hurd_sigstate *
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_hurd_self_sigstate (void)
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{
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if (THREAD_GETMEM (THREAD_SELF, _hurd_sigstate) == NULL)
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THREAD_SETMEM (THREAD_SELF, _hurd_sigstate, _hurd_thread_sigstate (__mach_thread_self ()));
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{
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thread_t self = __mach_thread_self ();
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THREAD_SETMEM (THREAD_SELF, _hurd_sigstate, _hurd_thread_sigstate (self));
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__mach_port_deallocate (__mach_task_self (), self);
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}
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return THREAD_GETMEM (THREAD_SELF, _hurd_sigstate);
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}
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# endif
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@ -210,12 +218,15 @@ _hurd_critical_section_lock (void)
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ss = THREAD_GETMEM (THREAD_SELF, _hurd_sigstate);
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if (ss == NULL)
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{
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thread_t self = __mach_thread_self ();
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/* The thread variable is unset; this must be the first time we've
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asked for it. In this case, the critical section flag cannot
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possible already be set. Look up our sigstate structure the slow
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way. */
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ss = _hurd_thread_sigstate (__mach_thread_self ());
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THREAD_SETMEM(THREAD_SELF, _hurd_sigstate, ss);
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ss = _hurd_thread_sigstate (self);
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THREAD_SETMEM (THREAD_SELF, _hurd_sigstate, ss);
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__mach_port_deallocate (__mach_task_self (), self);
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}
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if (! __spin_try_lock (&ss->critical_section_lock))
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@ -114,6 +114,8 @@ _hurd_thread_sigstate (thread_t thread)
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}
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else
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{
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error_t err;
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/* Use the global actions as a default for new threads. */
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struct hurd_sigstate *s = _hurd_global_sigstate;
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if (s)
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@ -127,6 +129,11 @@ _hurd_thread_sigstate (thread_t thread)
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ss->next = _hurd_sigstates;
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_hurd_sigstates = ss;
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err = __mach_port_mod_refs (__mach_task_self (), thread,
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MACH_PORT_RIGHT_SEND, 1);
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if (err)
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__libc_fatal ("hurd: Can't add reference on Mach thread\n");
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}
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}
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__mutex_unlock (&_hurd_siglock);
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@ -135,8 +142,7 @@ _hurd_thread_sigstate (thread_t thread)
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libc_hidden_def (_hurd_thread_sigstate)
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/* Destroy a sigstate structure. Called by libpthread just before the
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* corresponding thread is terminated (the kernel thread port must remain valid
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* until this function is called.) */
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* corresponding thread is terminated. */
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void
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_hurd_sigstate_delete (thread_t thread)
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{
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@ -153,7 +159,12 @@ _hurd_sigstate_delete (thread_t thread)
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__mutex_unlock (&_hurd_siglock);
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if (ss)
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free (ss);
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{
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if (ss->thread != MACH_PORT_NULL)
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__mach_port_deallocate (__mach_task_self (), ss->thread);
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free (ss);
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}
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}
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/* Make SS a global receiver, with pthread signal semantics. */
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