From 0c3837ef8fe77b0d65094f6a2cf3d7b17bcc7cbf Mon Sep 17 00:00:00 2001 From: Christian Cunningham Date: Fri, 18 Mar 2022 13:39:56 -0700 Subject: Added mutex management queues --- src/util/mutex.c | 56 +++++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 41 insertions(+), 15 deletions(-) (limited to 'src/util') diff --git a/src/util/mutex.c b/src/util/mutex.c index 3171501..226bfbc 100644 --- a/src/util/mutex.c +++ b/src/util/mutex.c @@ -1,26 +1,52 @@ #include #include -struct Mutex* create_mutex(void* addr) +void mutex_init(void) { for (unsigned long m = 0; m < MAX_MUTEXS; m++) { - if (mutex_table[m] == 0) { - mutex_table[m] = (unsigned long)addr; - mutexs[m].pid = 0; - mutexs[m].addr = addr; - return &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)%MAX_MUTEXS]; } - return 0; + // 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; + // Initialize In-use Mutexs + mutex_manager.used.start.value = 0; + mutex_manager.used.start.next = &mutex_manager.used.end; + mutex_manager.used.start.entry_type = START_ENTRY; + mutex_manager.used.end.value = 0; + mutex_manager.used.end.next = &mutex_manager.used.start; + mutex_manager.used.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; + push_to_queue(e, &mutex_manager.used); + return e->value; } unsigned char delete_mutex(struct Mutex* m) { - for (unsigned long i = 0; i < MAX_MUTEXS; i++) { - if (mutex_table[i] == (unsigned long)m->addr) { - mutex_table[i] = 0; - return 0; - } - } - return 1; + struct Entry* entry = find_value(m, &mutex_manager.used); + if (entry == 0) + return 1; + // Remove it from the queue + remove_next_from_queue(entry); + // Add it to the free queue + prepend_to_queue(entry, &mutex_manager.free); + return 0; } -- cgit v1.2.1