/*===========================================================================*
* handle_work *
*===========================================================================*/
static void handle_work(void *(*func)(void *arg))
{
/* Handle asynchronous device replies and new system calls. If the originating
* endpoint is an FS endpoint, take extra care not to get in deadlock. */
struct vmnt *vmp = NULL;
endpoint_t proc_e;
proc_e = m_in.m_source;
if (fp->fp_flags & FP_SYS_PROC) {
if (worker_available() == 0) {
if (!deadlock_resolving) {
if ((vmp = find_vmnt(proc_e)) != NULL) {
/* A call back or dev result from an FS
* endpoint. Set call back flag. Can do only
* one call back at a time.
*/
if (vmp->m_flags & VMNT_CALLBACK) {
reply(proc_e, EAGAIN);
return;
}
vmp->m_flags |= VMNT_CALLBACK;
/* When an FS endpoint has to make a call back
* in order to mount, force its device to a
* "none device" so block reads/writes will be
* handled by ROOT_FS_E.
*/
if (vmp->m_flags & VMNT_MOUNTING)
vmp->m_flags |= VMNT_FORCEROOTBSF;
}
deadlock_resolving = 1;
dl_worker_start(func);
return;
}
/* Already trying to resolve a deadlock, can't
* handle more, sorry */
reply(proc_e, EAGAIN);
return;
}
}
worker_start(func);
}
/*===========================================================================*
* handle_work *
*===========================================================================*/
static void handle_work(void (*func)(void))
{
/* Handle asynchronous device replies and new system calls. If the originating
* endpoint is an FS endpoint, take extra care not to get in deadlock. */
struct vmnt *vmp = NULL;
endpoint_t proc_e;
int use_spare = FALSE;
proc_e = m_in.m_source;
if (fp->fp_flags & FP_SRV_PROC) {
vmp = find_vmnt(proc_e);
if (vmp != NULL) {
/* A callback from an FS endpoint. Can do only one at once. */
if (vmp->m_flags & VMNT_CALLBACK) {
replycode(proc_e, EAGAIN);
return;
}
/* Already trying to resolve a deadlock? Can't handle more. */
if (worker_available() == 0) {
replycode(proc_e, EAGAIN);
return;
}
/* A thread is available. Set callback flag. */
vmp->m_flags |= VMNT_CALLBACK;
if (vmp->m_flags & VMNT_MOUNTING) {
vmp->m_flags |= VMNT_FORCEROOTBSF;
}
}
/* Use the spare thread to handle this request if needed. */
use_spare = TRUE;
}
worker_start(fp, func, &m_in, use_spare);
}
