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Ran 15 Nov 2021 01:12PM UTC

Files 364

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Committed 14 Nov 2021 01:12AM UTC coverage: 89.392% (-0.02%) from 89.411%

Job # #37060.1

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push

local

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web-flow

Commit Message

Make profiling more robust with many tasks (#42978)

This patch includes two sets of changes.

(1) `jl_thread_suspend_and_get_state` uses `pthread_cond_timedwait` to
recover from the case where the request is not received by the signal
handler. This is required because `usr2_handler` contains some paths
for the case where it is not possible to obtain `ptls`.

(2) `ctx_switch` now makes sure to null out `ptls` of the last task
(`lastt->ptls = NULL`) after changing the current task by updating
pgcstack (`jl_set_pgcstack(&t->gcstack)`).  This closes the gap in
which `usr2_handler` can observe the null `ptls`.

Co-authored-by: Jameson Nash <vtjnash@gmail.com>

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