06-24-2009
I think that works pretty logically to me.
Activity/registrations are like demographics ( births/deaths ) so for it to be skewed by reclaiming bits doesn't really matter.
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LEARN ABOUT MOJAVE
os_activity_initiate_f
os_activity_initiate(3) BSD Library Functions Manual os_activity_initiate(3)
NAME
os_activity_initiate, os_activity_initiate_f -- activity related routines
SYNOPSIS
#include <os/activity.h>
void
os_activity_initiate(const char *description, uint32_t flags, void (^activity_block)(void));
void
os_activity_initiate_f(const char *description, uint32_t flags, void *ctx, void function(void *ctx));
DESCRIPTION
An activity is essentially an identifier that is created by the system. The identifier is transported with work via GCD, XPC and other mecha-
nisms. The identifier simplifies debugging programs since it correlates the trace and log messages to the area in question. Although an
activity appears to have a start/end, it is only finished when no other work related to it is enqueued to be processed. Activity functions
only allow constant strings for performance and privacy, similar to os_trace(3).
Supported Activity Name:
os_activity_initiate("indexing database", OS_ACTIVITY_FLAG_DEFAULT, ^(void) {
[self indexDatabase];
});
Unsupported Activity Name:
snprintf(buffer, "indexing database for %s", username);
os_activity_initiate(buffer, OS_ACTIVITY_FLAG_DEFAULT, ^(void) {
[self indexDatabase];
});
os_activity_initiate and os_activity_initiate_f wraps the block or function with a new activity.
EXAMPLES
Example use of activity with a message.
#include <os/trace.h>
#include <os/activity.h>
- (IBOutlet) indexDatabase:(id) sender {
os_activity_initiate("index database", OS_ACTIVITY_FLAG_DEFAULT, ^{
os_trace("re-indexing database for %d", self.uid);
[self reIndex: self.uid];
});
}
SEE ALSO
os_trace(3), os_log(3)
Darwin June 1, 2019 Darwin