Boost C++ Libraries: Ticket #9285: CreateMutex return NULL if failed

Ion Gaztañaga — Sun, 27 Oct 2013 12:27:36 GMT

Thanks for the report. It will changed to handle a nullptr. winapi_mutex_wrapper also shares the same bug described in your #9288 ("timed_wait does not check if has expired") ticket.

status changed; resolution set

Ion Gaztañaga — Sun, 27 Oct 2013 12:28:56 GMT

status new → closed
resolution → fixed

(In [86476]) Fixes #9285

huyuguang@… — Mon, 28 Oct 2013 02:51:05 GMT

Replying to igaztanaga:

Thanks for the report. It will changed to handle a nullptr. winapi_mutex_wrapper also shares the same bug described in your #9288 ("timed_wait does not check if has expired") ticket.

I suggest you remove the #define BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION in workaround.hpp

#if defined(_WIN32)

defined(WIN32)

#define BOOST_INTERPROCESS_WINDOWS #define BOOST_INTERPROCESS_FORCE_GENERIC_EMULATION #define BOOST_INTERPROCESS_HAS_KERNEL_BOOTTIME

If a server need to handle multiple message queue, for example, 64 queues, the spinlock would kill too much cpu. Also, if possible, I hope you can implement two more function which are multi_timed_recv and multi_timed_send, so that I can wait multiple queue and do not need to lanuch many threads for every queues.

Ion Gaztañaga — Mon, 28 Oct 2013 17:03:39 GMT

Native synchronization primitives are experimental so they are not enabled by default. spinlock handling will be improved in Boost 1.55 so CPU usage will be pretty low.

anonymous — Tue, 29 Oct 2013 01:53:15 GMT

Replying to igaztanaga:

Native synchronization primitives are experimental so they are not enabled by default. spinlock handling will be improved in Boost 1.55 so CPU usage will be pretty low.

I just checked the latest code boost 1.55 beta, now the spinlock use _mm_pause. Maybe it will be better, but I really really want you implement a actor based message queue. I hope I can write the code as async_recv(queue, buffer_ptr, [buffer_ptr](size_t cb) {}), and I can handle multiple queues's recv and send in one thread.