DragonFly-2.3.1.552.g32816 master lib/libthread_xu/thread thr_se
commit 328161bd22eeafdb109345d38e56c3e8948a7ad6
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date: Mon Jun 29 15:38:53 2009 -0700
libthread_xu - implement pshared for sem_init
Implement the pshared flag, creating a semaphore in shared memory
that works across fork(). No additional kernel support is needed,
our umtx* system calls work on the underlying physical memory and
thus work just fine with shared memory.
sem_alloc() uses mmap() to allocate a page of shared memory.
Currently sem_destroy() does not recover the allocated memory for
shared semaphores as it is unclear how one is supposed to do so
in a fork()ed environment.
Requested-by: Hasso Tepper <hasso@estpak.ee>
Summary of changes:
lib/libthread_xu/thread/thr_sem.c | 61 +++++++++++++++++++++++++-----------
1 files changed, 42 insertions(+), 19 deletions(-)
http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/328161bd22eeafdb109345d38e56c3e8948a7ad6
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