lib/common/mutex_emul.c

#include "ipf.h"

#define EMM_MAGIC   0x9d7adba3

void eMmutex_enter(mtx, file, line)
eMmutex_t *mtx;
char *file;
int line;
{
    if (mtx->eMm_magic != EMM_MAGIC) {
        fprintf(stderr, "%s:eMmutex_enter(%p): bad magic: %#x\n",
            mtx->eMm_owner, mtx, mtx->eMm_magic);
        abort();
    }
    if (mtx->eMm_held != 0) {
        fprintf(stderr, "%s:eMmutex_enter(%p): already locked: %d\n",
            mtx->eMm_owner, mtx, mtx->eMm_held);
        abort();
    }
    mtx->eMm_held++;
    mtx->eMm_heldin = file;
    mtx->eMm_heldat = line;
}


void eMmutex_exit(mtx)
eMmutex_t *mtx;
{
    if (mtx->eMm_magic != EMM_MAGIC) {
        fprintf(stderr, "%s:eMmutex_exit(%p): bad magic: %#x\n",
            mtx->eMm_owner, mtx, mtx->eMm_magic);
        abort();
    }
    if (mtx->eMm_held != 1) {
        fprintf(stderr, "%s:eMmutex_exit(%p): not locked: %d\n",
            mtx->eMm_owner, mtx, mtx->eMm_held);
        abort();
    }
    mtx->eMm_held--;
    mtx->eMm_heldin = NULL;
    mtx->eMm_heldat = 0;
}


void eMmutex_init(mtx, who)
eMmutex_t *mtx;
char *who;
{
    if (mtx->eMm_magic == EMM_MAGIC) {  /* safe bet ? */
        fprintf(stderr,
            "%s:eMmutex_init(%p): already initialised?: %#x\n",
            mtx->eMm_owner, mtx, mtx->eMm_magic);
        abort();
    }
    mtx->eMm_magic = EMM_MAGIC;
    mtx->eMm_held = 0;
    if (who != NULL)
        mtx->eMm_owner = strdup(who);
    else
        mtx->eMm_owner = NULL;
}


void eMmutex_destroy(mtx)
eMmutex_t *mtx;
{
    if (mtx->eMm_magic != EMM_MAGIC) {
        fprintf(stderr, "%s:eMmutex_destroy(%p): bad magic: %#x\n",
            mtx->eMm_owner, mtx, mtx->eMm_magic);
        abort();
    }
    if (mtx->eMm_held != 0) {
        fprintf(stderr, "%s:eMmutex_enter(%p): still locked: %d\n",
            mtx->eMm_owner, mtx, mtx->eMm_held);
        abort();
    }
    memset(mtx, 0xa5, sizeof(*mtx));
}