David Howells 930e652a21 [PATCH] NOMMU: Make futexes work under NOMMU conditions ... Make futexes work under NOMMU conditions. This can be tested by running this in one shell: #define SYSERROR(X, Y) \ do { if ((long)(X) == -1L) { perror(Y); exit(1); }} while(0) int main() { int shmid, tmp, *f, n; shmid = shmget(23, 4, IPC_CREAT|0666); SYSERROR(shmid, "shmget"); f = shmat(shmid, NULL, 0); SYSERROR(f, "shmat"); n = *f; printf("WAIT: %p{%x}\n", f, n); tmp = futex(f, FUTEX_WAIT, n, NULL, NULL, 0); SYSERROR(tmp, "futex"); printf("WAITED: %d\n", tmp); tmp = shmdt(f); SYSERROR(tmp, "shmdt"); exit(0); } And then this in the other shell: #define SYSERROR(X, Y) \ do { if ((long)(X) == -1L) { perror(Y); exit(1); }} while(0) int main() { int shmid, tmp, *f; shmid = shmget(23, 4, IPC_CREAT|0666); SYSERROR(shmid, "shmget"); f = shmat(shmid, NULL, 0); SYSERROR(f, "shmat"); (*f)++; printf("WAKE: %p{%x}\n", f, *f); tmp = futex(f, FUTEX_WAKE, 1, NULL, NULL, 0); SYSERROR(tmp, "futex"); printf("WOKE: %d\n", tmp); tmp = shmdt(f); SYSERROR(tmp, "shmdt"); exit(0); } The first program will set up a SYSV IPC SHM segment and wait on a futex in it for the number at the start to change. The program will increment that number and wake the first program up. This leads to output of the form: SHELL 1 SHELL 2 ======================= ======================= # /dowait WAIT: 0xc32ac000{0} # /dowake WAKE: 0xc32ac000{1} WAITED: 0 WOKE: 1 Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-09-27 08:26:15 -07:00
..
allocpercpu.c
bootmem.c
fadvise.c
filemap_xip.c
filemap.c
filemap.h
fremap.c
highmem.c
hugetlb.c
internal.h
Kconfig
madvise.c
Makefile
memory_hotplug.c
memory.c	[PATCH] NOMMU: Check that access_process_vm() has a valid target	2006-09-27 08:26:14 -07:00
mempolicy.c	[PATCH] GFP_THISNODE for the slab allocator	2006-09-27 08:26:12 -07:00
mempool.c
migrate.c
mincore.c
mlock.c
mmap.c
mmzone.c
mprotect.c
mremap.c
msync.c
nommu.c	[PATCH] NOMMU: Make futexes work under NOMMU conditions	2006-09-27 08:26:15 -07:00
oom_kill.c
page_alloc.c	[PATCH] mm/page_alloc: use NULL instead of 0 for ptr	2006-09-27 08:26:13 -07:00
page_io.c	[PATCH] swsusp: read speedup	2006-09-26 08:48:58 -07:00
page-writeback.c
pdflush.c
prio_tree.c
readahead.c
rmap.c
shmem.c	[PATCH] Really ignore kmem_cache_destroy return value	2006-09-27 08:26:10 -07:00
slab.c	[PATCH] GFP_THISNODE for the slab allocator	2006-09-27 08:26:12 -07:00
slob.c	[PATCH] Make kmem_cache_destroy() return void	2006-09-27 08:26:11 -07:00
sparse.c
swap_state.c
swap.c
swapfile.c
thrash.c
tiny-shmem.c
truncate.c	[PATCH] page invalidation cleanup	2006-09-27 08:26:12 -07:00
util.c
vmalloc.c	[PATCH] Mark __remove_vm_area() static	2006-09-27 08:26:13 -07:00
vmscan.c	[PATCH] page invalidation cleanup	2006-09-27 08:26:12 -07:00
vmstat.c	[PATCH] zone_statistics: Use hot node instead of cold zone_pgdat	2006-09-27 08:26:13 -07:00