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We should be able to reuse this between the implementation of C11 cnd_t condition variables and POSIX pthread_cond_t condition variables. The current implementation is hyper linux specific, making use of Futex. That obviously wont work outside of linux, so split the OS specific functions off into their own source outside of the header. Modifies the return values of the to-be-shared impl to return 0 on success and -1 on error. This pattern was shamelessly stolen from Bionic's [__bionic_thrd_error](https://android.googlesource.com/platform/bionic/+/refs/heads/main/libc/include/bits/threads_inlines.h#41). Fixes: #88580 Link: #88583
LLVM libc ========= This directory and its subdirectories contain source code for llvm-libc, a retargetable implementation of the C standard library. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt.