I think the use of ordering here is irregular. In teaclave, there will be no 
simultaneous read and write operations to CALLBACK_FN, GLOBAL_HASH_BUFFER and 
GLOBAL_COND_BUFFER in a multi-threaded environment, only simultaneous reads to 
them occur, so I think Ordering::Relaxed can be used here.
You can view, comment on, or merge this pull request online at:

  https://github.com/apache/incubator-teaclave-sgx-sdk/pull/425

-- Commit Summary --

  * Fixed ordering

-- File Changes --

    M samplecode/localattestation/attestation/src/func.rs (6)
    M samplecode/psi/SMCServer/enclave/src/lib.rs (6)
    M samplecode/thread/enclave/src/lib.rs (6)

-- Patch Links --

https://github.com/apache/incubator-teaclave-sgx-sdk/pull/425.patch
https://github.com/apache/incubator-teaclave-sgx-sdk/pull/425.diff

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