tmux Splits the Terminal into Panes: A Tree, Not a Geometry Problem
The hard part of tmux’s pane splitting isn’t the geometry — it’s serialisability.
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PostgreSQL Waits for Locks: The Spin, Sleep, and Kernel Ladder
PostgreSQL’s wait ladder spins in user space, then backs off with a jittered exponential delay so spinners don’t convoy, and only then blocks in the kernel — and it learns how long …
PostgreSQL's timestamp and timestamptz Implementation in C
Both types are int64 microseconds since 2000-01-01; the only real difference is input/output consulting the session TimeZone, so comparing a timestamp to a timestamptz can flip on …
PostgreSQL's bool Implementation in C: One Byte, Two Spellings
bool is one byte on disk but eight bytes of Datum in memory — and it has two text spellings (’t’ vs ’true’) that depend purely on which function the cast picks.
PostgreSQL Locks Buffers Without LWLocks: One 64-Bit Word
PostgreSQL 20 moved buffer content locks out of the LWLock machinery and into the buffer’s own 64-bit state word, so taking one costs a single compare-and-swap.