[haiku-bugs] [Haiku] #9771: _single_threaded not updated in case of SIGEV_THREAD
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Wed, 15 May 2013 13:10:11 -0000
#9771: _single_threaded not updated in case of SIGEV_THREAD
-------------------------------+------------------------------
Reporter: bonefish | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: System/libroot.so | Version: R1/Development
Keywords: | Blocked By:
Blocking: | Has a Patch: 0
Platform: All |
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libroot's `_single_threaded` global variable (<stdio_post.h>) is only
updated in `spawn_thread()`. A `SIGEV_THREAD` signal handler will also
create a thread, but the variable won't be set in that case, since it is
only done in `spawn_thread()`. By the time the thread has been created, it
may be too late to set the flag, since the main thread may already be in
the middle of a libroot function that requires locking in a multi-threaded
program, so it is probably best to set the variable already when the
signal handler is set.
A similar problem (without solution) exists when a thread is created in a
signal handler function.
It should also be considered to alias `{getc,putc}_unlocked()` with the
locking version and omit the variable (save for keeping the storage for
binary compatibility).
--
Ticket URL: <http://dev.haiku-os.org/ticket/9771>
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