Make profile_tasks variable thread local to prevent race condition. #4
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Accessing TLS variables has a shockingly high cost on some OSes. I can look at this after getting back from vacation, but my gut feeling is that we don't want TLS reads in a perf-sensitive threading library. |
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I see, yes it's good to be cautious. We don't want to have a performance cost for this. As you probably guessed, the reason I am fixing this is because our (latest) threading sanitizer caught the potential race condition in accessing this variable. I am always happy to push back fixes to the open source version, but only if they don't worsen the public code obviously :) |
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The
profile_tasksvariable is currently not thread local. This is in conflict with its use in drjit-core: There it is set withinjitc_set_flags, which can be called from multiple threads. All the drjit-core flags are therefore thread local. This commit makes theprofile_tasksvariable thread local to be consistent with the way flags are handled in drjit-core.