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Use Darling reserved key definitions from libpthread
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Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/darling/emulation/tsd.h
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Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/darling/emulation/tsd.h
···
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../../../../../../../../../../src/external/xnu/darling/src/libsystem_kernel/emulation/linux/tsd.h
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src/xtrace/tls.cpp
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src/xtrace/tls.cpp
···
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};
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// since we still need to handle some calls after pthread_terminate is called and libpthread unwinds its TLS right before calling pthread_terminate,
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// we have to use a slightly hackier technique: using one of the system's reserved but unused TLS keys.
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// key 200 seems like a good fit; it's in the reserved region but it's not currently listed in `pthread/tsd_private.h` as being in-use by anything.
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// we have to use a slightly hackier technique: using one of the system's reserved but unused TLS keys; we use one from the range we currently reserve
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// for Darling.
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#define __PTK_XTRACE_TLS 200
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#include <darling/emulation/tsd.h>
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// TODO: also perform TLS cleanup for other threads when doing a fork
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extern "C"
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void xtrace_tls_thread_cleanup(void) {
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tls_table_t table = (tls_table_t)_pthread_getspecific_direct(__PTK_XTRACE_TLS);
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tls_table_t table = (tls_table_t)_pthread_getspecific_direct(__PTK_DARLING_XTRACE_TLS);
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if (!table) {
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xtrace_tls_debug("no table to cleanup for this thread");
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return;
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void* xtrace_tls(void* key, size_t size, bool* created, xtrace_tls_destructor_f destructor) {
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xtrace_tls_debug("looking up tls variable for key %p", key);
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tls_table_t table = (tls_table_t)_pthread_getspecific_direct(__PTK_XTRACE_TLS);
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tls_table_t table = (tls_table_t)_pthread_getspecific_direct(__PTK_DARLING_XTRACE_TLS);
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xtrace_tls_debug("got %p as table pointer from pthread", table);
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···
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xtrace_abort("xtrace: failed TLS table memory allocation");
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}
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table->size = 0;
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_pthread_setspecific_direct(__PTK_XTRACE_TLS, table);
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_pthread_setspecific_direct(__PTK_DARLING_XTRACE_TLS, table);
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}
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// check if the key is already present