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#include <cpu.h>
#include <drivers/uart.h>
#include <util/mutex.h>
#include <util/lock.h>
#include <globals.h>
void mutex_init(void)
{
for (unsigned long m = 0; m < MAX_MUTEXS; m++) {
mutexs[m].pid = 0;
mutexs[m].addr = 0;
mutex_entries[m].value = &mutexs[m];
mutex_entries[m].entry_type = VALUE_ENTRY;
mutex_entries[m].next = &mutex_entries[m+1];
}
// Initialize Free Mutexs
mutex_manager.free.start.value = 0;
mutex_manager.free.start.next = &mutex_entries[0];
mutex_manager.free.start.entry_type = START_ENTRY;
mutex_manager.free.end.value = 0;
mutex_manager.free.end.next = &mutex_entries[MAX_MUTEXS-1];
mutex_entries[MAX_MUTEXS-1].next = &mutex_manager.free.end;
mutex_manager.free.end.entry_type = END_ENTRY;
}
struct Mutex* create_mutex(void* addr)
{
struct Entry* e = pop_from_queue(&mutex_manager.free);
if (e == 0)
return 0;
struct Mutex* m = e->value;
m->pid = 0;
m->addr = addr;
mutex_manager.used_mutexes++;
return e->value;
}
unsigned char delete_mutex(struct Mutex* m)
{
unsigned long spacing = (unsigned long)&mutexs[1] - (unsigned long)&mutexs[0];
unsigned long difference = (unsigned long)m - (unsigned long)&mutexs[0];
unsigned long index = difference/spacing;
if (index >= MAX_MUTEXS)
return 1;
struct Entry* entry = &mutex_entries[index];
// Add it to the free queue
prepend_to_queue(entry, &mutex_manager.free);
return 0;
}
void uart_mutexes(void)
{
uart_hexn(mutex_manager.used_mutexes);
}
unsigned char lock_mutex(struct Mutex* m)
{
struct Thread* rthread = scheduler.rthread;
unsigned long mode = getmode() & 0x1F;
if (mode == 0x10) {
unsigned long spacing = (unsigned long)&mutexs[1] - (unsigned long)&mutexs[0];
unsigned long difference = (unsigned long)m - (unsigned long)&mutexs[0];
unsigned long index = difference/spacing;
// If it is not a managed mutex, break away
if (index >= MAX_MUTEXS)
return 1;
if ((unsigned char) index > rthread->highest_mutex)
return 2;
sys1(SYS_LOCK, m);
return 0;
}
return 3;
}
void unlock_mutex(struct Mutex* m)
{
unlock((struct Lock*)m);
}
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