• Clemens Hammacher's avatar
    Reland "[wasm] Decouple background compile jobs from NativeModule" · eab3508a
    Clemens Hammacher authored
    This is a reland of 92d9b09c.
    Patch unchanged, errors fixed by https://crrev.com/c/1430059.
    
    Original change's description:
    > [wasm] Decouple background compile jobs from NativeModule
    >
    > Background compile jobs should not keep the NativeModule alive, for two
    > reasons:
    > 1) We sometimes have to wait for background compilation to finish (from
    >    a foreground task!). This introduces unnecessary latency.
    > 2) Giving the background compile tasks shared ownership of the
    >    NativeModule causes the NativeModule (and the CompilationState) to
    >    be freed from background tasks, which is error-prone (see
    >    https://crrev.com/c/1400420).
    >
    > Instead, this CL introduces a BackgroundCompileToken which is held
    > alive by the NativeModule and all background compile jobs. The initial
    > and the final phase of compilation (getting and submitting work)
    > synchronize on this token to check and ensure that the NativeModule is
    > and stays alive. During compilation itself, the mutex is released, such
    > that the NativeModule can die.
    > The destructor of the NativeModule cancels the BackgroundCompileToken.
    > Immediately afterwards, the NativeModule and the CompilationState can
    > die.
    >
    > This change allows to remove two hacks introduced previously: The atomic
    > {aborted_} flag and the {FreeCallbacksTask}.
    >
    > R=mstarzinger@chromium.org
    > CC=titzer@chromium.org
    >
    > Bug: v8:8689, v8:7921
    > Change-Id: I42e06eab3c944b0988286f2ce18e3c294535dfb6
    > Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel
    > Reviewed-on: https://chromium-review.googlesource.com/c/1421364
    > Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
    > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
    > Cr-Commit-Position: refs/heads/master@{#59020}
    
    TBR=mstarzinger@chromium.org
    
    Bug: v8:8689, v8:7921
    Change-Id: Iead972ef77c8503da7246cab48e7693b176d8f02
    Cq-Include-Trybots: luci.v8.try:v8_linux64_tsan_rel
    Reviewed-on: https://chromium-review.googlesource.com/c/1429862Reviewed-by: 's avatarClemens Hammacher <clemensh@chromium.org>
    Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#59035}
    eab3508a
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