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Full Discussion: help me out with my threaded c++ mudbase - c++, pthread_cond_wait
Top Forums Programming help me out with my threaded c++ mudbase - c++, pthread_cond_wait Post 302133670 by porter on Friday 24th of August 2007 03:40:14 PM
Old 08-24-2007
Threads and signals are a bad mix.

In a threaded program you should

(a) have one thread devoted to receiving signals for the process using sigwait, this would then deal with each signal in an orderly manner. This will deal with all signals targetted at the *process*, (SIGINT, SIGQUIT etc). Do a SIG_BLOCK for all these signals in every other thread or before you create those threads so they inherit the signal mask.

(b) set up pthread_cleanup_push/pthread_cleanup_pop to protect each group of local variables to cope with SIGSEGV etc. Set up a single signal handler in the application for SIGSEGV etc that calls pthread_exit(PTHREAD_CANCELLED) or similar.

Also note that some compilers, eg g++ don't destruct C++ objects as they go out of scope during a thread cancellation.
 

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LEARN ABOUT OPENSOLARIS

ldi_getmsg

ldi_putmsg(9F)						   Kernel Functions for Drivers 					    ldi_putmsg(9F)

NAME

       ldi_putmsg, ldi_getmsg - Read/write message blocks from/to a stream

SYNOPSIS

       #include <sys/sunldi.h>

       int ldi_putmsg(ldi_handle_t lh, mblk_t *smp);

       int  ldi_getmsg(ldi_handle_t lh, mblk_t **rmp, timestruc_t *timeo);

PARAMETERS

       lh	 Layered handle.

       smp	 Message block to send.

       rmp	 Message block to receive.

       timeo	 Optional timeout for data reception.

DESCRIPTION

       The  ldi_putmsg	function  allows a caller to send a message block to a streams device specified by the layered handle lh. Once the message
       (smp) has been passed to ldi_putmsg(), the caller must not free the message even if an error occurs.

       The ldi_getmsg() function allows a caller to receive a message block from a streams device specified by the layered handle lh. Callers must
       free the message received with freemsg(9F).

       If a NULL timeout value is specified when the caller receives a message, the caller sleeps until a message is received.

RETURN VALUES

       The ldi_putmsg() and ldi_getmsg() functions return 0 upon success. If a failure occurs before the request is passed to the device, the pos-
       sible return values are shown below. Otherwise any other error number may be returned by the device.

       EINVAL	  Invalid input parameters.

       ENOTSUP	  Operation is not supported for this device.

		  The ldi_getmsg() function may also return:

		  ETIME    Returned if the timeout timeo expires with no messages received.

CONTEXT

       These functions may be called from user or kernel context.

SunOS 5.11							    3 June 2003 						    ldi_putmsg(9F)
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