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authorJeff Dike <jdike@addtoit.com>2006-09-25 23:33:04 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-09-26 08:49:07 -0700
commit19bdf0409f25a85a45874a5a8da6f3e4edcf4a49 (patch)
tree82abcba44b8026b3dab0e6d26bdf3109bc6bb0cf /arch/um/include
parent6edf428ed177e333863a8e5c37751a9ec176f241 (diff)
[PATCH] uml: SIGIO cleanups
- Various cleanups in the sigio code. - Removed explicit zero-initializations of a few structures. - Improved some error messages. - An API change - there was an asymmetry between reactivate_fd calling maybe_sigio_broken, which goes through all the machinery of figuring out if a file descriptor supports SIGIO and applying the workaround to it if not, and deactivate_fd, which just turns off the descriptor. This is changed so that only activate_fd calls maybe_sigio_broken, when the descriptor is first seen. reactivate_fd now calls add_sigio_fd, which is symmetric with ignore_sigio_fd. This removes a recursion which makes a critical section look more critical than it really was, obsoleting a big comment to that effect. This requires keeping track of all descriptors which are getting the SIGIO treatment, not just the ones being polled at any given moment, so that reactivate_fd, through add_sigio_fd, doesn't try to tell the SIGIO thread about descriptors it doesn't care about. Signed-off-by: Jeff Dike <jdike@addtoit.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/um/include')
-rw-r--r--arch/um/include/os.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 5316e8a4a4f..c73dfa78f94 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -329,6 +329,7 @@ extern void os_set_ioignore(void);
extern void init_irq_signals(int on_sigstack);
/* sigio.c */
+extern int add_sigio_fd(int fd);
extern int ignore_sigio_fd(int fd);
extern void maybe_sigio_broken(int fd, int read);