apps: replace atomic_fetch_xxx with atomic_xxx

[zhangyu-duck]

Summary

Rename atomic_fetch_xxx to atomic_xxx (e.g., atomic_fetch_add -> atomic_add) and atomic_store/atomic_load to atomic_set/atomic_read, to match the <nuttx/atomic.h> API rename in the companion nuttx PR.

The atomic_fetch_xxx naming is reserved by the C/C++ standard and conflicts with standard library declarations when <atomic>/<stdatomic.h> is included by third-party code.

Files changed

• crypto/openssl_mbedtls_wrapper/mbedtls/ssl_lib.c
• testing/libc/atomic/atomic_main.c
• testing/ostest/roundrobin.c
• testing/ostest/spinlock.c

[github-actions]

🔗 Cross-repo PR dependencies

The read-only Build run reported the following dependent PR(s) and fetched head SHA(s):

• atomic: multi-backend framework + builtin + API rename nuttx#19867 @ 8f4e0a4f9d

CI run: https://github.com/apache/nuttx-apps/actions/runs/32134898362

[github-actions]

❌ Cross-repo dependency could not be applied

The Build report says the declared dependency PR(s) could not be applied, so CI did not run against the combined code:

• atomic: multi-backend framework + builtin + API rename nuttx#19867

Reason: cherry-pick failed (if your PR has merge commits, rebase instead)

CI run: https://github.com/apache/nuttx-apps/actions/runs/32698218070

[zhangyu-duck]

The checkpatch Mixed case identifier errors in ssl_lib.c are pre-existing issues from the OpenSSL API (e.g., SSL_get1_session, SSL_ASSERT2, SSL_SESSION_free). These are OpenSSL/mbedtls function names defined by the upstream API and cannot be renamed. This PR only changes atomic_fetch_add → atomic_add and atomic_fetch_sub → atomic_sub (2 lines). The entire file is full of these mixed case identifiers, so fixing them would require rewriting the whole file against the OpenSSL API, which is not practical.

[xiaoxiang781216]

The checkpatch Mixed case identifier errors in ssl_lib.c are pre-existing issues from the OpenSSL API (e.g., SSL_get1_session, SSL_ASSERT2, SSL_SESSION_free). These are OpenSSL/mbedtls function names defined by the upstream API and cannot be renamed. This PR only changes atomic_fetch_add → atomic_add and atomic_fetch_sub → atomic_sub (2 lines). The entire file is full of these mixed case identifiers, so fixing them would require rewriting the whole file against the OpenSSL API, which is not practical.

let's ignore openssl mix case warning and merge it directly to resolve the ci error:

../nuttx/tools/checkpatch.sh -c -u -m -g 44d1f6c05a57ebd936642dd8127d2d3542f1e2fb..HEAD
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/openssl_mbedtls_wrapper/mbedtls/ssl_lib.c:50:20: error: Mixed case identifier found
Error: /home/runner/work/nuttx-apps/nuttx-apps/apps/crypto/openssl_mbedtls_wrapper/mbedtls/ssl_lib.c:61:18: error: Mixed case identifier found