threaded_test.c File Reference

Concurrent stress test for MEOS thread-local state (issue #404). More...

#include <pthread.h>
#include <stdatomic.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <meos.h>
#include <meos_geo.h>

Data Structures
struct	worker_arg

Functions
int	main (int argc, char **argv)
static void *	worker (void *arg)

Detailed Description

Concurrent stress test for MEOS thread-local state (issue #404).

Each worker thread independently runs the full lifecycle: meos_initialize() → parse a unique WKT temporal point in a hot loop (exercises the per-thread WKT lexer/parser globals + GMT bootstrap) → read-only queries on the parsed value → thread-unique meos_errno round-trip → meos_finalize()

Verifies:

• meos_initialize/finalize can be called concurrently without racing on shared library state;
• WKT parsing (geometry_in / tgeompoint_in / ...) works concurrently because the lwgeom flex/bison globals are now MEOS_TLS;
• meos_errno reads/writes remain isolated per thread;
• the GMT timezone bootstrap (postgres/timezone/localtime.c) is no longer racy under concurrent first-use.

Build (Linux, after cmake --install to a prefix):

gcc -Wall -g -O2 -I<prefix>/include -pthread \
    -o threaded_test threaded_test.c -L<prefix>/lib -lmeos
./threaded_test 8 5000   # 8 threads, 5000 iterations each

Run under TSan for race detection: rebuild MEOS and the test with -fsanitize=thread.