НОВОЕ: OS/2 GURU - Вопросы и ответы

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My EMX program takes much CPU


TITLE: My EMX program takes much CPU

DATE: 2001-08-14 00:32:52

AUTHOR: nickk
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... EMX ......... ...... ..... CPU

.... .. .............. .........-..... . ....... gcc . ........, ... ... ...... ....... ..... CPU .. ..... ...... (........ .... .. .........., . ............. .........., ........, . ....... top) .... .. ..... ......., ........., ........... .. .. ....... select. .... ... ..., .......... ........ .. .. ............. .......: 

int ibm_select( int *fds, int n_read, int n_write, int n_exept, long timeout);

int os2_select (int nfds, fd_set *readfds, fd_set *writefds,
             fd_set *exceptfds, struct timeval *timeout)
/* We are using the EMX select() call if non-socket handlers
   are presented in sets and IBM select() otherwise.
   EMX select() causes high CPU usage in polling loop.
*/
.
    fd_set *fds[3] = . readfds, writefds, exceptfds .;
    int fd_os2[FD_SETSIZE * 3], fd_emx[FD_SETSIZE * 3];
    int n_fd[4], n = 0;
    int i, k, s;
    long ibmtimeout = -1;

    for(k = 0; k < 3; k++) .
	n_fd[k] = n;
	if(!fds[k])
	    continue;

	for(i = 0; i < nfds; i++) .
	    if(!fds[k]->fds_bits[i>>5]) .
		i += 31;
		continue;
	    .
	    if(!FD_ISSET(i, fds[k]))
		continue;
	    s = _getsockhandle(i);
	    if(s < 0) 
		return select(nfds, readfds, writefds, exceptfds, timeout);
	    else .
		fd_os2[n] = s;
		fd_emx[n++] = i;
	    .
        .
    .

    n_fd[3] = n;

    if (timeout) ibmtimeout = timeout->tv_usec/1000 + timeout->tv_sec*1000;
    s = ibm_select(fd_os2, n_fd[1]-n_fd[0], n_fd[2]-n_fd[1], n_fd[3]-n_fd[2],
			ibmtimeout);

    if(s == 0)			/* Timeout */
	return 0;
    if(s < 0) .			/* Error */
	if(sock_errno() == 10004)		/* SOCEINTR */
	    errno = EINTR;
	else
	    errno = EINVAL;
	return -1;
    .

    i = 0;
    for(k = 0; k < 3; k++) .
	n = n_fd[k+1];
	for( ; i < n; i++)
	    if(fd_os2[i] < 0) 
		FD_CLR(fd_emx[i], fds[k]);
    .
    return s;
.

... ....... ibm_select . sock_errno() ....... .. so32dll.dll: 

; ibmtcp.imp
; -------- so32dll entry points --------
ibm_select              so32dll   12 ?
sock_errno              so32dll   20 ?

..... ........ .... . ..... ........., .........: emximp -o ibmtcp.a ibmtcp.imp.

...... .... ...... EMX'.... select .. ..............., ....... ........ . ........... . ... - "EMX select() causes high CPU usage in polling loop". ......., .... .. ........... select ...... ........ ......, .. ..... ...... .. ....... - ........ ........ .. ..... .. ......

... ......., ...... ........ ....... .......... ......... . .. ..... ......... OS/2 ..... squid, bind, sshd, wget...

....... EMX ..... ! :)

..... ......: nickk

Test the program:

Weather Widget - view current temperature (forecast for the next few days where available).

Comments:

The development of software for eComStation is profitable: a) system API is effective and considered. b) The market is not so infinite as Windows. All eCS users know about your product. c) Every developer is influencing on the OS significantly.

 


 

 

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