blob: 0e1c8165a25dcfc12e569f4d5f33b00ecc9b8d32 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
#include <cpu/atomic/swap.h>
#include <globals.h>
#include <lib/mem.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*)malloca(sizeof(struct Mutex), 4);
m->addr = addr;
return m;
}
|
