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test(e2e): native + CBOR concurrency stress harness
Hammers one shared context from several threads, alternating the two ABIs of the same library: the native path (EchoRequest struct in, typed EchoResponse* back) and the CBOR path (encoded request in, CBOR map back), each verifying the echoed message round-trips. Exercises the POD deep-copy/free on the way in, the respPod deliver/free on the way out, and the request channel under contention. Run plain or with SAN=address / SAN=thread. Clean at 6 threads x 1500 iters (9000 calls per ABI) under both ASAN and TSAN — no leaks, use-after-free, or data races. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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‎tests/e2e/c/.gitignore‎

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/stress
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/libmy_timer.dylib
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/libmy_timer.so
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/build/

‎tests/e2e/c/Makefile‎

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# Build + run the native/CBOR concurrency stress test for the timer example.
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#
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# make stress # plain build + run
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# make stress SAN=address # AddressSanitizer
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# make stress SAN=thread # ThreadSanitizer
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# make clean
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#
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# Drives the real exported ABI of the timer example library, so it links the
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# same dylib the C/Go consumers do. The library is built from the repo root so
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# its vendored Nimble dependencies resolve.
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REPO_ROOT := $(abspath ../../..)
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NIM_SRC := $(REPO_ROOT)/examples/timer/timer.nim
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HDR_DIR := $(REPO_ROOT)/examples/timer/c_bindings
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UNAME_S := $(shell uname -s)
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ifeq ($(UNAME_S),Darwin)
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LIBNAME := libmy_timer.dylib
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RPATH := -Wl,-rpath,.
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else
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LIBNAME := libmy_timer.so
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RPATH := -Wl,-rpath,'$$ORIGIN'
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endif
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CC ?= cc
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CFLAGS ?= -std=c11 -Wall -Wextra -O1 -g -I$(HDR_DIR)
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NIMFLAGS := --mm:orc -d:chronicles_log_level=WARN --app:lib --noMain \
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--nimMainPrefix:libmy_timer
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# Optional sanitizer: SAN=address | thread | undefined
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ifneq ($(SAN),)
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SANFLAGS := -fsanitize=$(SAN) -fno-omit-frame-pointer
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CFLAGS += $(SANFLAGS)
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LDSAN := $(SANFLAGS)
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NIMFLAGS += -d:useMalloc --passC:-fsanitize=$(SAN) --passL:-fsanitize=$(SAN)
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endif
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.PHONY: stress clean
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$(LIBNAME):
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cd $(REPO_ROOT) && nim c $(NIMFLAGS) -o:$(CURDIR)/$(LIBNAME) $(NIM_SRC)
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stress: stress.c $(HDR_DIR)/my_timer.h $(LIBNAME)
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$(CC) $(CFLAGS) stress.c -L. -lmy_timer -lpthread $(RPATH) $(LDSAN) -o stress
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./stress
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clean:
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rm -f stress $(LIBNAME)

‎tests/e2e/c/stress.c‎

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// Concurrency + memory stress for BOTH ABIs of one library:
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// - native (pure C): EchoRequest struct in, typed EchoResponse* back
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// - CBOR: encoded request in, CBOR EchoResponse map back
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//
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// Many threads hammer a shared context with both call shapes, each verifying
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// the echoed message round-trips. Built to run under ASAN/TSAN to flush out
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// leaks, use-after-free in the POD deep-copy/free paths, and data races.
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//
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// make stress && ./stress # plain
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// make stress SAN=address # -fsanitize=address
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// make stress SAN=thread # -fsanitize=thread
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#include "my_timer.h"
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#include "my_timer_cbor.h"
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#include <pthread.h>
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#include <stdatomic.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#ifndef STRESS_THREADS
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#define STRESS_THREADS 6
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#endif
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#ifndef STRESS_ITERS
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#define STRESS_ITERS 1500
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#endif
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static atomic_long g_ok;
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static atomic_long g_bad;
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// --- per-call blocking capture ----------------------------------------------
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typedef struct {
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int ret, done;
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char echoed[128]; // copied out of the typed return / decoded from CBOR
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pthread_mutex_t mu;
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pthread_cond_t cv;
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} Cap;
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static void cap_init(Cap *c) {
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memset(c, 0, sizeof(*c));
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pthread_mutex_init(&c->mu, NULL);
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pthread_cond_init(&c->cv, NULL);
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}
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static void cap_destroy(Cap *c) {
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pthread_mutex_destroy(&c->mu);
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pthread_cond_destroy(&c->cv);
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}
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static void cap_reset(Cap *c) {
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pthread_mutex_lock(&c->mu);
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c->done = 0;
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c->echoed[0] = 0;
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pthread_mutex_unlock(&c->mu);
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}
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static void cap_wait(Cap *c) {
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pthread_mutex_lock(&c->mu);
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while (!c->done) pthread_cond_wait(&c->cv, &c->mu);
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pthread_mutex_unlock(&c->mu);
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}
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// Native EchoResponse return: read the typed struct in-callback.
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static void native_cb(int ret, const char *msg, size_t len, void *ud) {
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Cap *c = ud;
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pthread_mutex_lock(&c->mu);
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c->ret = ret;
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if (ret == RET_OK) {
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const EchoResponse *r = (const EchoResponse *)msg;
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strncpy(c->echoed, r->echoed, sizeof(c->echoed) - 1);
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}
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c->done = 1;
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pthread_cond_signal(&c->cv);
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pthread_mutex_unlock(&c->mu);
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(void)len;
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}
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// --- minimal CBOR map text reader (for the CBOR EchoResponse) ---------------
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static size_t cbor_item_len(const uint8_t *p, size_t len) {
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if (len < 1) return 0;
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uint8_t major = p[0] >> 5, info = p[0] & 0x1f;
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size_t head = 1;
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uint64_t arg = info;
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if (info == 24) { if (len < 2) return 0; arg = p[1]; head = 2; }
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else if (info == 25) { if (len < 3) return 0; arg = ((uint64_t)p[1] << 8) | p[2]; head = 3; }
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else if (info == 26) { if (len < 5) return 0; arg = ((uint64_t)p[1] << 24)|((uint64_t)p[2] << 16)|((uint64_t)p[3] << 8)|p[4]; head = 5; }
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else if (info == 27) { if (len < 9) return 0; arg = 0; for (int i = 1; i <= 8; i++) arg = (arg << 8) | p[i]; head = 9; }
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else if (info >= 28) return 0;
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switch (major) {
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case 0: case 1: case 7: return head;
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case 2: case 3: return head + (size_t)arg;
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case 4: { size_t off = head; for (uint64_t i = 0; i < arg; i++) { size_t n = cbor_item_len(p+off, len-off); if (!n) return 0; off += n; } return off; }
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case 5: { size_t off = head; for (uint64_t i = 0; i < arg*2; i++) { size_t n = cbor_item_len(p+off, len-off); if (!n) return 0; off += n; } return off; }
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default: return 0;
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}
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}
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static int cbor_get_text(const uint8_t *p, size_t len, const char *key, char *out, size_t cap) {
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if (len < 1 || (p[0] >> 5) != 5) return 0;
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uint8_t info = p[0] & 0x1f;
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if (info >= 24) return 0;
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size_t off = 1, klen = strlen(key);
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for (uint64_t i = 0; i < info; i++) {
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const uint8_t *k = p + off;
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if ((k[0] >> 5) != 3) return 0;
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uint8_t ki = k[0] & 0x1f;
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if (ki >= 24) return 0;
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const uint8_t *v = p + off + 1 + ki;
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if ((size_t)ki == klen && memcmp(k + 1, key, klen) == 0 && (v[0] >> 5) == 3) {
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uint8_t vi = v[0] & 0x1f;
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if (vi >= 24) return 0;
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size_t n = vi < cap - 1 ? vi : cap - 1;
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memcpy(out, v + 1, n);
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out[n] = 0;
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return 1;
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}
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size_t vn = cbor_item_len(v, len - (off + 1 + ki));
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if (!vn) return 0;
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off += 1 + ki + vn;
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}
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return 0;
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}
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// CBOR EchoResponse return: decode the "echoed" field in-callback.
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static void cbor_cb(int ret, const char *msg, size_t len, void *ud) {
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Cap *c = ud;
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pthread_mutex_lock(&c->mu);
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c->ret = ret;
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if (ret == RET_OK)
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cbor_get_text((const uint8_t *)msg, len, "echoed", c->echoed, sizeof(c->echoed));
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c->done = 1;
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pthread_cond_signal(&c->cv);
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pthread_mutex_unlock(&c->mu);
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}
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struct Args { void *ctx; int id; };
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static void *worker(void *p) {
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struct Args *a = p;
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Cap cap;
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cap_init(&cap);
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char want[128];
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for (int i = 0; i < STRESS_ITERS; i++) {
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snprintf(want, sizeof(want), "t%d-i%d", a->id, i);
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if (i & 1) {
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// native: EchoRequest in, typed EchoResponse* back
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cap_reset(&cap);
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EchoRequest req = {.message = want, .delayMs = 0};
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if (my_timer_echo(a->ctx, native_cb, &cap, req) == RET_OK) cap_wait(&cap);
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} else {
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// CBOR: { "req": { "message": want, "delayMs": 0 } }
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cap_reset(&cap);
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FfiCbor e = ffi_cbor_new();
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ffi_cbor_map(&e, 1);
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ffi_cbor_text(&e, "req");
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ffi_cbor_map(&e, 2);
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ffi_cbor_kv_text(&e, "message", want);
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ffi_cbor_kv_int(&e, "delayMs", 0);
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if (my_timer_echo_cbor(a->ctx, cbor_cb, &cap, e.buf, e.len) == RET_OK)
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cap_wait(&cap);
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ffi_cbor_free(&e);
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}
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if (cap.ret == RET_OK && strcmp(cap.echoed, want) == 0)
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atomic_fetch_add(&g_ok, 1);
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else
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atomic_fetch_add(&g_bad, 1);
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}
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cap_destroy(&cap);
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return NULL;
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}
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static void create_cb(int ret, const char *msg, size_t len, void *ud) {
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Cap *c = ud;
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pthread_mutex_lock(&c->mu);
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c->ret = ret;
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c->done = 1;
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pthread_cond_signal(&c->cv);
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pthread_mutex_unlock(&c->mu);
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(void)msg; (void)len;
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}
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int main(void) {
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Cap cc;
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cap_init(&cc);
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TimerConfig cfg = {.name = "stress"};
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void *ctx = my_timer_create(cfg, create_cb, &cc);
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cap_wait(&cc);
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if (!ctx) { fprintf(stderr, "create failed\n"); return 1; }
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pthread_t th[STRESS_THREADS];
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struct Args args[STRESS_THREADS];
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for (int i = 0; i < STRESS_THREADS; i++) {
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args[i].ctx = ctx;
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args[i].id = i;
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pthread_create(&th[i], NULL, worker, &args[i]);
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}
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for (int i = 0; i < STRESS_THREADS; i++) pthread_join(th[i], NULL);
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my_timer_destroy(ctx);
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cap_destroy(&cc);
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long ok = atomic_load(&g_ok), bad = atomic_load(&g_bad);
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long total = (long)STRESS_THREADS * STRESS_ITERS;
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printf("native+cbor stress: %ld/%ld ok, %ld bad (%d threads x %d iters)\n", ok,
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total, bad, STRESS_THREADS, STRESS_ITERS);
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printf(bad == 0 && ok == total ? "PASSED\n" : "FAILED\n");
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return (bad == 0 && ok == total) ? 0 : 1;
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}

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