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#include <cpu/atomic/swap.h>
#include <globals.h>
#include <lib/kmem.h>
#include <sys/schedule.h>
#include <util/mutex.h>
unsigned char lock_mutex(struct Mutex* m, unsigned long pid)
{
if (m->pid == NULL_PID) {
// Use currently running thread's PID if no pid given
if (pid == 0) {
struct Thread* thread = scheduler.rthread;
atm_lock(thread->pid, &m->pid);
} else {
atm_lock(pid, &m->pid);
}
return 0;
}
struct Thread* thread = scheduler.rthread;
thread->status = THREAD_MWAIT;
thread->mptr = m;
return 1;
}
// Eventually, there will need to be a hook into the scheduling mechanism
// that checks the currently running process and check that against the
// mutex's pid lock
unsigned char release_mutex(struct Mutex* m, unsigned long pid)
{
// Use current thread's PID if no pid
if (pid == 0) {
struct Thread* thread = scheduler.rthread;
if (m->pid == thread->pid) {
atm_release(&m->pid);
return 0;
}
}
else if (m->pid == pid) {
atm_release(&m->pid);
return 0;
}
return 1;
}
struct Mutex* create_mutex(void* addr)
{
// Ensure aligned to word - Important for Atomic Swap
struct Mutex* m = (struct Mutex*)kmalloc(sizeof(struct Mutex));
m->addr = addr;
m->pid = 0;
return m;
}
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