[SDKv2] resumable downloads (cross-process lock + per-chunk state + linked cancellation)#793

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bmehta001 wants to merge 37 commits into

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bhamehta/flcore/resumable-downloads

Commits on Jun 18, 2026

sdk_v2/cpp: cross-process lock + skip-existing for downloads

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sdk_v2/cpp: per-chunk resumable downloads with linked cancellation

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Stream blob chunks via per-worker scratch + IFileWriter (caps per-worker memory at 64 KB)

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Fix Linux/macOS -Werror build break + MutexFstream sticky-failbit

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Preserve resume progress on transient stat / rename failures

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CrossProcessFileLock: drop self-cleanup; persist lock file across releases

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Revert "CrossProcessFileLock: drop self-cleanup; persist lock file across releases"
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refactor(download): collapse file writer to a single concrete FileWriter

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fix(download): per-model serialization + airtight cross-process lock

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fixup(rebase): resolve semantic conflicts against main's download refactor

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fix(download): correct SaveState prefix advance across a 64-bit word boundary

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fix(download): persist sidecar before pre-allocating, so a crash stays resumable

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fix(download): serialize the user progress callback across chunk workers

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feat(download): also flush the resume sidecar on a wall-clock cap

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Fix comment
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download: clarify state-sidecar serialization naming and docs

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download: fixed-size sidecar interval; drop test-only cancel plumbing

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Rename function
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test(download): add a true cross-process lock test (POSIX)

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Commits on Jun 19, 2026

Commits on Jun 20, 2026