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TITLE: My EMX program takes much CPU

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

AUTHOR: nickk

... 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 ..... ! :)

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