mark.c File Reference

#include <xinu.h>

Include dependency graph for mark.c:

Go to the source code of this file.

Functions
status	mark (int32 *loc)
void	markinit (void)

Variables
int32 *	marks [MAXMARK]
sid32	mkmutex
int32	nmarks

Function Documentation

mark()

status mark

(

int32 *

loc

)

Definition at line 24 of file mark.c.

References marks, MAXMARK, mkmutex, nmarks, OK, signal(), SYSERR, and wait().

{

    /* If location is already marked, do nothing */

    if ( (*loc>=0) && (*loc<nmarks) && (marks[*loc]==loc) ) {
        return OK;
    }

    /* If no more memory marks are available, indicate an error */

    if (nmarks >= MAXMARK) {
        return SYSERR;
    }

    /* Obtain exclusive access and mark the specified location */

    wait(mkmutex);
    marks[ (*loc) = nmarks++ ] = loc;
    signal(mkmutex);
    return OK;
}

Here is the call graph for this function:

markinit()

void markinit

(

void

)

Definition at line 13 of file mark.c.

References mkmutex, nmarks, and semcreate().

{
    nmarks = 0;
    mkmutex = semcreate(1);
}

Here is the call graph for this function:

Variable Documentation

marks

int32* marks[MAXMARK]

Definition at line 5 of file mark.c.

Referenced by mark().

mkmutex

sid32 mkmutex

Definition at line 7 of file mark.c.

Referenced by mark(), and markinit().

nmarks

int32 nmarks

Definition at line 6 of file mark.c.

Referenced by mark(), and markinit().