#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));
}