[libvirt] [PATCH RFC 43/48] iohelpermessagetest: test non-blocking read & write
Michal Privoznik
mprivozn at redhat.com
Wed Jun 22 14:44:00 UTC 2016
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
tests/iohelpermessagetest.c | 295 +++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 292 insertions(+), 3 deletions(-)
diff --git a/tests/iohelpermessagetest.c b/tests/iohelpermessagetest.c
index 293c107..8c83261 100644
--- a/tests/iohelpermessagetest.c
+++ b/tests/iohelpermessagetest.c
@@ -27,6 +27,7 @@
#include "internal.h"
#include "iohelper_message.h"
#include "virlog.h"
+#include "virtime.h"
VIR_LOG_INIT("tests.iohelpermessagetest");
@@ -35,6 +36,8 @@ VIR_LOG_INIT("tests.iohelpermessagetest");
typedef struct {
const char * const *msg;
unsigned int *len;
+ bool blockR;
+ bool blockW;
} testData;
typedef testData *testDataPtr;
@@ -77,7 +80,7 @@ testBlocking(const void *opaque)
char *genMsg = NULL;
char buf[1024];
- if (testInit(ioCtl, pipeFD, true, true) < 0)
+ if (testInit(ioCtl, pipeFD, data->blockR, data->blockW) < 0)
goto cleanup;
while (!quit) {
@@ -143,15 +146,253 @@ testBlocking(const void *opaque)
return ret;
}
+typedef struct {
+ virMutexPtr lock;
+ virCondPtr cond;
+ bool finished;
+ int ret;
+ iohelperCtlPtr ioCtl;
+ char *msg;
+ size_t msgLen;
+} threadData;
+
+typedef threadData *threadDataPtr;
+
+static void
+readerThread(void *opaque)
+{
+ threadDataPtr data = opaque;
+ char *bigBuf = NULL;
+ size_t bigBufSize = 0;
+
+ virObjectRef(data->ioCtl);
+ /* Sleep some random time to simulate out of sync read &
+ * write */
+ usleep((rand() % 100) * 1000);
+
+ while (true) {
+ char buf[10]; /* Simulate reads of small chunks of data */
+ ssize_t nread;
+
+ reread:
+ nread = iohelperRead(data->ioCtl, buf, sizeof(buf));
+ if (nread < 0) {
+ if (errno == EAGAIN) {
+ usleep(20 * 1000);
+ goto reread;
+ }
+
+ virFilePrintf(stderr, "Unable to read message (errno=%d)\n", errno);
+ goto cleanup;
+ }
+
+ if (!nread)
+ break;
+
+ if (VIR_REALLOC_N(bigBuf, bigBufSize + nread) < 0)
+ goto cleanup;
+
+ memcpy(bigBuf + bigBufSize, buf, nread);
+ bigBufSize += nread;
+ }
+
+ if (bigBufSize != data->msgLen) {
+ virFilePrintf(stderr, "Message length mismatch: expected %zu got %zu",
+ data->msgLen, bigBufSize);
+ goto cleanup;
+ }
+
+ if (memcmp(bigBuf, data->msg, data->msgLen)) {
+ virFilePrintf(stderr, "Mismatched data");
+ goto cleanup;
+ }
+
+ data->ret = 0;
+
+ cleanup:
+ VIR_FREE(bigBuf);
+ virObjectUnref(data->ioCtl);
+ virMutexLock(data->lock);
+ data->finished = true;
+ virCondSignal(data->cond);
+ virMutexUnlock(data->lock);
+}
+
+static void
+writerThread(void *opaque ATTRIBUTE_UNUSED)
+{
+ threadDataPtr data = opaque;
+ size_t writeOff = 0;
+
+ virObjectRef(data->ioCtl);
+ /* Sleep some random time to simulate out of sync read &
+ * write */
+ usleep((rand() % 100) * 1000);
+
+ while (true) {
+ ssize_t nwritten;
+ size_t want = data->msgLen - writeOff;
+
+ if (!want)
+ break;
+
+ rewrite:
+ nwritten = iohelperWrite(data->ioCtl,
+ data->msg + writeOff,
+ want);
+
+ if (nwritten < 0) {
+ if (errno == EAGAIN) {
+ usleep(20 * 1000);
+ goto rewrite;
+ }
+
+ virFilePrintf(stderr, "Unable to write message (errno=%d)\n", errno);
+ goto cleanup;
+ }
+
+ if (!nwritten)
+ break;
+
+ writeOff += nwritten;
+ }
+
+ if (writeOff != data->msgLen) {
+ virFilePrintf(stderr, "Message length mismatch: expected %zu written %zu",
+ data->msgLen, writeOff);
+ goto cleanup;
+ }
+
+ data->ret = 0;
+
+ cleanup:
+ virObjectUnref(data->ioCtl);
+ virMutexLock(data->lock);
+ data->finished = true;
+ virCondSignal(data->cond);
+ virMutexUnlock(data->lock);
+}
+
+/* How long wait (in ms) for both reader & writer
+ * threads to finish? */
+#define WAIT_TIME 10000
+
+static int
+testNonblocking(const void *opaque)
+{
+ int ret = -1;
+ const testData *data = opaque;
+ iohelperCtlPtr ioCtl[2] = {NULL, NULL};
+ int pipeFD[2] = {-1, -1};
+ virThread reader, writer;
+ threadData readerD, writerD;
+ virMutex lock;
+ virCond cond;
+ unsigned long long now;
+ unsigned long long then;
+ char *msg = NULL;
+ size_t msgLen = 0, idx;
+
+ for (idx = 0; data->msg && data->msg[idx]; idx++) {
+ const char *tmp = data->msg[idx];
+ size_t tmpLen = strlen(tmp);
+
+ if (VIR_REALLOC_N(msg, msgLen + tmpLen + 1) < 0)
+ goto cleanup;
+
+ memcpy(msg + msgLen, tmp, tmpLen + 1);
+ msgLen += tmpLen;
+ }
+
+ for (idx = 0; data->len && data->len[idx]; idx++) {
+ size_t tmpLen = data->len[idx];
+
+ if (VIR_REALLOC_N(msg, msgLen + tmpLen) < 0)
+ goto cleanup;
+ msgLen += tmpLen;
+
+ /* Here @msg contains some garbage that was on the heap
+ * when the memory was allocated. That's okay, we want to
+ * be sure iohelper can deal with binary garbage. */
+ }
+
+ if (virMutexInit(&lock) < 0 ||
+ virCondInit(&cond) < 0)
+ goto cleanup;
+
+ if (testInit(ioCtl, pipeFD, data->blockR, data->blockW) < 0)
+ goto cleanup;
+
+ readerD = writerD = (threadData) {.lock = &lock, .cond = &cond,
+ .ret = -1, .finished = false, .msg = msg, msgLen = msgLen};
+ readerD.ioCtl = ioCtl[0];
+ writerD.ioCtl = ioCtl[1];
+
+ /* Now, ideally we would set the kernel's pipe buffer to be
+ * small. Really small. Couple of bytes perhaps so that we
+ * can be sure writes wrap around it just nicely. But the
+ * smallest possible size is PAGESIZE. Trying to set anything
+ * smaller than that is silently rounded up to PAGESIZE.
+ * Okay, in that case we should write multiple of that. */
+ fcntl(pipeFD[0], F_SETPIPE_SZ, 0);
+
+ virMutexLock(&lock);
+
+ if (virThreadCreate(&reader, false, readerThread, &readerD) < 0 ||
+ virThreadCreate(&writer, false, writerThread, &writerD) < 0)
+ goto cleanup;
+
+ if (virTimeMillisNow(&now) < 0)
+ goto cleanup;
+
+ then = now + WAIT_TIME;
+
+ while (!readerD.finished ||
+ !writerD.finished) {
+ if (virCondWaitUntil(&cond, &lock, then) < 0) {
+ if (errno == ETIMEDOUT) {
+ if (!readerD.finished)
+ virThreadCancel(&reader);
+ if (!writerD.finished)
+ virThreadCancel(&writer);
+ }
+
+ goto cleanup;
+ }
+ if (readerD.finished)
+ VIR_FORCE_CLOSE(pipeFD[0]);
+ if (writerD.finished)
+ VIR_FORCE_CLOSE(pipeFD[1]);
+ }
+
+ if (readerD.ret < 0 ||
+ writerD.ret < 0)
+ goto cleanup;
+
+ ret = 0;
+ cleanup:
+ virMutexUnlock(&lock);
+ virMutexDestroy(&lock);
+ virCondDestroy(&cond);
+ virObjectUnref(ioCtl[0]);
+ virObjectUnref(ioCtl[1]);
+ VIR_FORCE_CLOSE(pipeFD[0]);
+ VIR_FORCE_CLOSE(pipeFD[1]);
+ return ret;
+}
+
static int
mymain(void)
{
int ret = 0;
+ srand(time(NULL));
+
#define DO_TEST_BLOCKING_SIMPLE(...) \
do { \
const char *msg[] = { __VA_ARGS__, NULL}; \
- testData data = {.msg = msg, .len = NULL }; \
+ testData data = {.blockR = true, .blockW = true, \
+ .msg = msg, .len = NULL }; \
if (virTestRun("Blocking simple", testBlocking, &data) < 0) \
ret = -1; \
} while (0)
@@ -159,11 +400,47 @@ mymain(void)
#define DO_TEST_BLOCKING_LEN(...) \
do { \
unsigned int len[] = { __VA_ARGS__, 0}; \
- testData data = {.msg = NULL, .len = len }; \
+ testData data = {.blockR = true, .blockW = true, \
+ .msg = NULL, .len = len }; \
if (virTestRun("Blocking len", testBlocking, &data) < 0) \
ret = -1; \
} while (0)
+#define DO_TEST_BLOCKR_SIMPLE(...) \
+ do { \
+ const char *msg[] = { __VA_ARGS__, NULL}; \
+ testData data = {.blockR = true, .blockW = false, \
+ .msg = msg, .len = NULL }; \
+ if (virTestRun("Blocking read simple", testNonblocking, &data) < 0) \
+ ret = -1; \
+ } while (0)
+
+#define DO_TEST_BLOCKR_LEN(...) \
+ do { \
+ unsigned int len[] = { __VA_ARGS__, 0}; \
+ testData data = {.blockR = true, .blockW = false, \
+ .msg = NULL, .len = len }; \
+ if (virTestRun("Blocking read len", testNonblocking, &data) < 0) \
+ ret = -1; \
+ } while (0)
+
+#define DO_TEST_BLOCKW_SIMPLE(...) \
+ do { \
+ const char *msg[] = { __VA_ARGS__, NULL}; \
+ testData data = {.blockR = false, .blockW = true, \
+ .msg = msg, .len = NULL }; \
+ if (virTestRun("Blocking write simple", testNonblocking, &data) < 0) \
+ ret = -1; \
+ } while (0)
+#define DO_TEST_BLOCKW_LEN(...) \
+ do { \
+ unsigned int len[] = { __VA_ARGS__, 0}; \
+ testData data = {.blockR = false, .blockW = true, \
+ .msg = NULL, .len = len }; \
+ if (virTestRun("Blocking write len", testNonblocking, &data) < 0) \
+ ret = -1; \
+ } while (0)
+
DO_TEST_BLOCKING_SIMPLE("Hello world");
DO_TEST_BLOCKING_SIMPLE("Hello world", "Hello", "world");
@@ -171,6 +448,18 @@ mymain(void)
DO_TEST_BLOCKING_LEN(1024);
DO_TEST_BLOCKING_LEN(32, 64, 128, 512, 1024);
+ DO_TEST_BLOCKR_SIMPLE("Hello world");
+ DO_TEST_BLOCKR_SIMPLE("Hello world", "Hello", "world");
+
+ DO_TEST_BLOCKR_LEN(1024);
+ DO_TEST_BLOCKR_LEN(409600);
+
+ DO_TEST_BLOCKW_SIMPLE("Hello world");
+ DO_TEST_BLOCKW_SIMPLE("Hello world", "Hello", "world");
+
+ DO_TEST_BLOCKW_LEN(1024);
+ DO_TEST_BLOCKW_LEN(409600);
+
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
--
2.8.4
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