[Webkit-unassigned] [Bug 242690] New: [WTF] Ensure isMainThread semantics for Linux match Apple/BSD semantics

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=242690

            Bug ID: 242690
           Summary: [WTF] Ensure isMainThread semantics for Linux match
                    Apple/BSD semantics
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: james.hilliard1 at gmail.com

It's not entirely clear if the current implementation semantics are fully identical between Linux and Apple/BSD systems. The Apple/BSD pthread_main_np function has 3 potential return values, 1 if the thread is the initial thread, 0 if it is not or -1 if thread is not initialized/unknown, lets make sure we only return true for isMainThread if the return for pthread_main_np is 1. On linux checking if we are on the initial thread can be accomplished by checking the equality of getpid and gettid. Note we use a syscall for calling gettid as the gettid() libc function may not be guaranteed to be supported by all libc's on Linux unlike the syscall(which is also used elsewhere in WebKit).

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