On Thu, May 15, 2014 at 10:39:09AM -0400, Carlos O'Donell wrote: > For example does gettid *really* return a pid_t as considered by > userspace? It's not a full out process... Yeah, PIDs and TIDs are the same namespace in the kernel. All we have are tasks and each task has an id. gettid() actually returns the id of the current task. getpid() returns the id of the thread group leader, so for that task gettid() and getpid() return the same id.
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