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Apply pending_writes after cooperating on behalf

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Apply pending_writes back to last_write after the collector cooperates on behalf of a mutator.
This commit is contained in:
Justin Ethier 2016-02-27 22:56:59 -05:00
parent 86bdf0c5aa
commit a98990b2e0
1 changed files with 12 additions and 4 deletions
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12
gc.c
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@ -717,13 +717,17 @@ void gc_zero_read_write_counts(gc_thread_data *thd)
/**
* Move pending writes to last_write
*/
void gc_sum_pending_writes(gc_thread_data *thd)
void gc_sum_pending_writes(gc_thread_data *thd, int locked)
{
if (!locked){
pthread_mutex_lock(&(thd->lock));
}
thd->last_write += thd->pending_writes;
thd->pending_writes = 0;
if (!locked) {
pthread_mutex_unlock(&(thd->lock));
}
}
/**
* Determine if object lives on the thread's stack
@ -784,7 +788,7 @@ void gc_mut_cooperate(gc_thread_data *thd, int buf_len)
#endif
// Handle any pending marks from write barrier
gc_sum_pending_writes(thd);
gc_sum_pending_writes(thd, 0);
// I think below is thread safe, but this code is tricky.
// Worst case should be that some work is done twice if there is
@ -1096,6 +1100,8 @@ void gc_wait_handshake()
pthread_mutex_lock(&(m->lock));
//printf("DEBUG - collector is cooperating for blocked mutator\n");
buf_len = gc_minor(m, m->stack_limit, m->stack_start, m->gc_cont, NULL, 0);
// Handle any pending marks from write barrier
gc_sum_pending_writes(m, 1);
// Mark thread "roots", based on code from mutator's cooperator
gc_mark_gray(m, m->gc_cont);
//for (i = 0; i < m->gc_num_args; i++) {
@ -1347,6 +1353,8 @@ void gc_mutator_thread_runnable(gc_thread_data *thd, object result)
thd->gc_num_args = 1;
// Move any remaining stack objects (should only be the result?) to heap
gc_minor(thd, &stack_limit, thd->stack_start, thd->gc_cont, thd->gc_args, thd->gc_num_args);
// Handle any pending marks from write barrier
gc_sum_pending_writes(thd, 0);
//printf("DEBUG - Call into gc_cont after collector coop\n");
// Whoa.
longjmp(*(thd->jmp_start), 1);