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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>		19 years ago
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Kconfig	Merge master.kernel.org:/pub/scm/linux/kernel/git/gregkh/pci-2.6	19 years ago
Makefile	[PATCH] Extract the allocpercpu functions from the slab allocator	19 years ago
allocpercpu.c	[PATCH] Extract the allocpercpu functions from the slab allocator	19 years ago
bootmem.c	[PATCH] bootmem: use MAX_DMA_ADDRESS instead of LOW32LIMIT	19 years ago
fadvise.c	[PATCH] fadvise() make POSIX_FADV_NOREUSE a no-op	19 years ago
filemap.c	[PATCH] update some mm/ comments	19 years ago
filemap.h	[PATCH] generic_file_buffered_write(): handle zero-length iovec segments	19 years ago
filemap_xip.c	[PATCH] mark address_space_operations const	19 years ago
fremap.c	[PATCH] mm: small cleanup of install_page()	19 years ago
highmem.c	[PATCH] reduce MAX_NR_ZONES: move HIGHMEM counters into highmem.c/.h	19 years ago
hugetlb.c	[PATCH] NUMA: Add zone_to_nid function	19 years ago
internal.h	[PATCH] mm: VM_BUG_ON	19 years ago
madvise.c	…
memory.c	[PATCH] NOMMU: Check that access_process_vm() has a valid target	19 years ago
memory_hotplug.c	[PATCH] memory hotadd fixes: enhance collision check	19 years ago
mempolicy.c	[PATCH] GFP_THISNODE for the slab allocator	19 years ago
mempool.c	[PATCH] dm: work around mempool_alloc, bio_alloc_bioset deadlocks	19 years ago
migrate.c	[PATCH] Define easier to handle GFP_THISNODE	19 years ago
mincore.c	…
mlock.c	…
mmap.c	[PATCH] ZVC: Support NR_SLAB_RECLAIMABLE / NR_SLAB_UNRECLAIMABLE	19 years ago
mmzone.c	[PATCH] mm/mmzone.c: EXPORT_UNUSED_SYMBOL	19 years ago
mprotect.c	[PATCH] mm: optimize the new mprotect() code a bit	19 years ago
mremap.c	[PATCH] lockdep: annotate mm	19 years ago
msync.c	[PATCH] mm: msync() cleanup	19 years ago
nommu.c	[PATCH] NOMMU: Make futexes work under NOMMU conditions	19 years ago
oom_kill.c	[PATCH] NUMA: Add zone_to_nid function	19 years ago
page-writeback.c	[PATCH] mm: non syncing lock_page()	19 years ago
page_alloc.c	[PATCH] mm/page_alloc: use NULL instead of 0 for ptr	19 years ago
page_io.c	[PATCH] swsusp: read speedup	19 years ago
pdflush.c	…
prio_tree.c	…
readahead.c	spelling fixes	19 years ago
rmap.c	[PATCH] mm: tracking shared dirty pages	19 years ago
shmem.c	[PATCH] Really ignore kmem_cache_destroy return value	19 years ago
slab.c	[PATCH] GFP_THISNODE for the slab allocator	19 years ago
slob.c	[PATCH] Make kmem_cache_destroy() return void	19 years ago
sparse.c	Remove obsolete #include <linux/config.h>	19 years ago
swap.c	[PATCH] mm/: make functions static	19 years ago
swap_state.c	[PATCH] lockdep: locking init debugging improvement	19 years ago
swapfile.c	[PATCH] swsusp: Fix swap_type_of	19 years ago
thrash.c	…
tiny-shmem.c	[PATCH] devfs: Remove the devfs_fs_kernel.h file from the tree	19 years ago
truncate.c	[PATCH] page invalidation cleanup	19 years ago
util.c	…
vmalloc.c	[PATCH] Mark __remove_vm_area() static	19 years ago
vmscan.c	[PATCH] page invalidation cleanup	19 years ago
vmstat.c	[PATCH] zone_statistics: Use hot node instead of cold zone_pgdat	19 years ago