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pthread_attr.c
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pthread_attr.c
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/*
* Copyright (c) 2024, Meta
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <pthread.h>
#include <zephyr/sys/util.h>
#include <zephyr/ztest.h>
#define BIOS_FOOD 0xB105F00D
#define SCHED_INVALID 4242
#define INVALID_DETACHSTATE 7373
static bool attr_valid;
static pthread_attr_t attr;
static const pthread_attr_t uninit_attr;
static bool detached_thread_has_finished;
/* TODO: this should be optional */
#define STATIC_THREAD_STACK_SIZE (MAX(1024, PTHREAD_STACK_MIN + CONFIG_TEST_EXTRA_STACK_SIZE))
static K_THREAD_STACK_DEFINE(static_thread_stack, STATIC_THREAD_STACK_SIZE);
static void *thread_entry(void *arg)
{
bool joinable = (bool)POINTER_TO_UINT(arg);
if (!joinable) {
detached_thread_has_finished = true;
}
return NULL;
}
static void create_thread_common(const pthread_attr_t *attrp, bool expect_success, bool joinable)
{
pthread_t th;
if (!joinable) {
detached_thread_has_finished = false;
}
if (expect_success) {
zassert_ok(pthread_create(&th, attrp, thread_entry, UINT_TO_POINTER(joinable)));
} else {
zassert_not_ok(pthread_create(&th, attrp, thread_entry, UINT_TO_POINTER(joinable)));
return;
}
if (joinable) {
zassert_ok(pthread_join(th, NULL), "failed to join joinable thread");
return;
}
/* should not be able to join detached thread */
zassert_not_ok(pthread_join(th, NULL));
for (size_t i = 0; i < 10; ++i) {
k_msleep(2 * CONFIG_PTHREAD_RECYCLER_DELAY_MS);
if (detached_thread_has_finished) {
break;
}
}
zassert_true(detached_thread_has_finished, "detached thread did not seem to finish");
}
static inline void can_create_thread(const pthread_attr_t *attrp)
{
create_thread_common(attrp, true, true);
}
static inline void cannot_create_thread(const pthread_attr_t *attrp)
{
create_thread_common(attrp, false, true);
}
ZTEST(pthread_attr, test_null_attr)
{
/*
* This test can only succeed when it is possible to call pthread_create() with a NULL
* pthread_attr_t* (I.e. when we have the ability to allocate thread stacks dynamically).
*/
create_thread_common(NULL, IS_ENABLED(CONFIG_DYNAMIC_THREAD) ? true : false, true);
}
ZTEST(pthread_attr, test_pthread_attr_static_corner_cases)
{
pthread_attr_t attr1;
Z_TEST_SKIP_IFDEF(CONFIG_DYNAMIC_THREAD);
/*
* These tests are specifically for when dynamic thread stacks are disabled, so passing
* a NULL pthread_attr_t* should fail.
*/
cannot_create_thread(NULL);
/*
* Additionally, without calling pthread_attr_setstack(), thread creation should fail.
*/
zassert_ok(pthread_attr_init(&attr1));
cannot_create_thread(&attr1);
}
ZTEST(pthread_attr, test_pthread_attr_init_destroy)
{
/* attr has already been initialized in before() */
if (false) {
/* undefined behaviour */
zassert_ok(pthread_attr_init(&attr));
}
/* cannot destroy an uninitialized attr */
zassert_equal(pthread_attr_destroy((pthread_attr_t *)&uninit_attr), EINVAL);
can_create_thread(&attr);
/* can destroy an initialized attr */
zassert_ok(pthread_attr_destroy(&attr), "failed to destroy an initialized attr");
attr_valid = false;
cannot_create_thread(&attr);
if (false) {
/* undefined behaviour */
zassert_ok(pthread_attr_destroy(&attr));
}
/* can re-initialize a destroyed attr */
zassert_ok(pthread_attr_init(&attr));
/* TODO: pthread_attr_init() should be sufficient to initialize a thread by itself */
zassert_ok(pthread_attr_setstack(&attr, &static_thread_stack, STATIC_THREAD_STACK_SIZE));
attr_valid = true;
can_create_thread(&attr);
/* note: attr is still valid and is destroyed in after() */
}
ZTEST(pthread_attr, test_pthread_attr_getguardsize)
{
size_t guardsize;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_getguardsize(NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getguardsize(NULL, &guardsize), EINVAL);
zassert_equal(pthread_attr_getguardsize(&uninit_attr, &guardsize), EINVAL);
}
zassert_equal(pthread_attr_getguardsize(&attr, NULL), EINVAL);
}
guardsize = BIOS_FOOD;
zassert_ok(pthread_attr_getguardsize(&attr, &guardsize));
zassert_not_equal(guardsize, BIOS_FOOD);
}
ZTEST(pthread_attr, test_pthread_attr_setguardsize)
{
size_t guardsize = CONFIG_POSIX_PTHREAD_ATTR_GUARDSIZE_DEFAULT;
size_t sizes[] = {0, BIT_MASK(CONFIG_POSIX_PTHREAD_ATTR_GUARDSIZE_BITS / 2),
BIT_MASK(CONFIG_POSIX_PTHREAD_ATTR_GUARDSIZE_BITS)};
/* valid value */
zassert_ok(pthread_attr_getguardsize(&attr, &guardsize));
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_setguardsize(NULL, SIZE_MAX), EINVAL);
zassert_equal(pthread_attr_setguardsize(NULL, guardsize), EINVAL);
zassert_equal(pthread_attr_setguardsize((pthread_attr_t *)&uninit_attr,
guardsize),
EINVAL);
}
zassert_equal(pthread_attr_setguardsize(&attr, SIZE_MAX), EINVAL);
}
ARRAY_FOR_EACH(sizes, i) {
zassert_ok(pthread_attr_setguardsize(&attr, sizes[i]));
guardsize = ~sizes[i];
zassert_ok(pthread_attr_getguardsize(&attr, &guardsize));
zassert_equal(guardsize, sizes[i]);
}
}
ZTEST(pthread_attr, test_pthread_attr_getschedparam)
{
struct sched_param param = {
.sched_priority = BIOS_FOOD,
};
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_getschedparam(NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getschedparam(NULL, ¶m), EINVAL);
zassert_equal(pthread_attr_getschedparam(&uninit_attr, ¶m), EINVAL);
}
zassert_equal(pthread_attr_getschedparam(&attr, NULL), EINVAL);
}
/* only check to see that the function succeeds and sets param */
zassert_ok(pthread_attr_getschedparam(&attr, ¶m));
zassert_not_equal(BIOS_FOOD, param.sched_priority);
}
ZTEST(pthread_attr, test_pthread_attr_setschedparam)
{
struct sched_param param = {0};
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_setschedparam(NULL, NULL), EINVAL);
zassert_equal(pthread_attr_setschedparam(NULL, ¶m), EINVAL);
zassert_equal(
pthread_attr_setschedparam((pthread_attr_t *)&uninit_attr, ¶m),
EINVAL);
}
zassert_equal(pthread_attr_setschedparam(&attr, NULL), EINVAL);
}
zassert_ok(pthread_attr_setschedparam(&attr, ¶m));
can_create_thread(&attr);
}
ZTEST(pthread_attr, test_pthread_attr_getschedpolicy)
{
int policy = BIOS_FOOD;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_getschedpolicy(NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getschedpolicy(NULL, &policy), EINVAL);
zassert_equal(pthread_attr_getschedpolicy(&uninit_attr, &policy), EINVAL);
}
zassert_equal(pthread_attr_getschedpolicy(&attr, NULL), EINVAL);
}
/* only check to see that the function succeeds and sets policy */
zassert_ok(pthread_attr_getschedpolicy(&attr, &policy));
zassert_not_equal(BIOS_FOOD, policy);
}
ZTEST(pthread_attr, test_pthread_attr_setschedpolicy)
{
int policy = SCHED_OTHER;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_setschedpolicy(NULL, SCHED_INVALID), EINVAL);
zassert_equal(pthread_attr_setschedpolicy(NULL, policy), EINVAL);
zassert_equal(
pthread_attr_setschedpolicy((pthread_attr_t *)&uninit_attr, policy),
EINVAL);
}
zassert_equal(pthread_attr_setschedpolicy(&attr, SCHED_INVALID), EINVAL);
}
zassert_ok(pthread_attr_setschedpolicy(&attr, SCHED_OTHER));
/* read back the same policy we just wrote */
policy = SCHED_INVALID;
zassert_ok(pthread_attr_getschedpolicy(&attr, &policy));
zassert_equal(policy, SCHED_OTHER);
can_create_thread(&attr);
}
ZTEST(pthread_attr, test_pthread_attr_getstack)
{
void *stackaddr = (void *)BIOS_FOOD;
size_t stacksize = BIOS_FOOD;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_getstack(NULL, NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getstack(NULL, NULL, &stacksize), EINVAL);
zassert_equal(pthread_attr_getstack(NULL, &stackaddr, NULL), EINVAL);
zassert_equal(pthread_attr_getstack(NULL, &stackaddr, &stacksize), EINVAL);
zassert_equal(pthread_attr_getstack(&uninit_attr, &stackaddr, &stacksize),
EINVAL);
}
zassert_equal(pthread_attr_getstack(&attr, NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getstack(&attr, NULL, &stacksize), EINVAL);
zassert_equal(pthread_attr_getstack(&attr, &stackaddr, NULL), EINVAL);
}
zassert_ok(pthread_attr_getstack(&attr, &stackaddr, &stacksize));
zassert_not_equal(stackaddr, (void *)BIOS_FOOD);
zassert_not_equal(stacksize, BIOS_FOOD);
}
ZTEST(pthread_attr, test_pthread_attr_setstack)
{
void *stackaddr;
size_t stacksize;
void *new_stackaddr;
size_t new_stacksize;
/* valid values */
zassert_ok(pthread_attr_getstack(&attr, &stackaddr, &stacksize));
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_setstack(NULL, NULL, 0), EACCES);
zassert_equal(pthread_attr_setstack(NULL, NULL, stacksize), EINVAL);
zassert_equal(pthread_attr_setstack(NULL, stackaddr, 0), EINVAL);
zassert_equal(pthread_attr_setstack(NULL, stackaddr, stacksize), EINVAL);
zassert_equal(pthread_attr_setstack((pthread_attr_t *)&uninit_attr,
stackaddr, stacksize),
EINVAL);
}
zassert_equal(pthread_attr_setstack(&attr, NULL, 0), EACCES);
zassert_equal(pthread_attr_setstack(&attr, NULL, stacksize), EACCES);
zassert_equal(pthread_attr_setstack(&attr, stackaddr, 0), EINVAL);
}
/* ensure we can create and join a thread with the default attrs */
can_create_thread(&attr);
/* set stack / addr to the current values of stack / addr */
zassert_ok(pthread_attr_setstack(&attr, stackaddr, stacksize));
can_create_thread(&attr);
/* qemu_x86 seems to be unable to set thread stacks to be anything less than 4096 */
if (!IS_ENABLED(CONFIG_X86)) {
/*
* check we can set a smaller stacksize
* should not require dynamic reallocation
* size may get rounded up to some alignment internally
*/
zassert_ok(pthread_attr_setstack(&attr, stackaddr, stacksize - 1));
/* ensure we read back the same values as we specified */
zassert_ok(pthread_attr_getstack(&attr, &new_stackaddr, &new_stacksize));
zassert_equal(new_stackaddr, stackaddr);
zassert_equal(new_stacksize, stacksize - 1);
can_create_thread(&attr);
}
if (IS_ENABLED(DYNAMIC_THREAD_ALLOC)) {
/* ensure we can set a dynamic stack */
k_thread_stack_t *stack;
stack = k_thread_stack_alloc(2 * stacksize, 0);
zassert_not_null(stack);
zassert_ok(pthread_attr_setstack(&attr, (void *)stack, 2 * stacksize));
/* ensure we read back the same values as we specified */
zassert_ok(pthread_attr_getstack(&attr, &new_stackaddr, &new_stacksize));
zassert_equal(new_stackaddr, (void *)stack);
zassert_equal(new_stacksize, 2 * stacksize);
can_create_thread(&attr);
}
}
ZTEST(pthread_attr, test_pthread_attr_getstacksize)
{
size_t stacksize = BIOS_FOOD;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_getstacksize(NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getstacksize(NULL, &stacksize), EINVAL);
zassert_equal(pthread_attr_getstacksize(&uninit_attr, &stacksize), EINVAL);
}
zassert_equal(pthread_attr_getstacksize(&attr, NULL), EINVAL);
}
zassert_ok(pthread_attr_getstacksize(&attr, &stacksize));
zassert_not_equal(stacksize, BIOS_FOOD);
}
ZTEST(pthread_attr, test_pthread_attr_setstacksize)
{
size_t stacksize;
size_t new_stacksize;
/* valid size */
zassert_ok(pthread_attr_getstacksize(&attr, &stacksize));
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_setstacksize(NULL, 0), EINVAL);
zassert_equal(pthread_attr_setstacksize(NULL, stacksize), EINVAL);
zassert_equal(pthread_attr_setstacksize((pthread_attr_t *)&uninit_attr,
stacksize),
EINVAL);
}
zassert_equal(pthread_attr_setstacksize(&attr, 0), EINVAL);
}
/* ensure we can spin up a thread with the default stack size */
can_create_thread(&attr);
/* set stack / addr to the current values of stack / addr */
zassert_ok(pthread_attr_setstacksize(&attr, stacksize));
/* ensure we can read back the values we just set */
zassert_ok(pthread_attr_getstacksize(&attr, &new_stacksize));
zassert_equal(new_stacksize, stacksize);
can_create_thread(&attr);
/* qemu_x86 seems to be unable to set thread stacks to be anything less than 4096 */
if (!IS_ENABLED(CONFIG_X86)) {
zassert_ok(pthread_attr_setstacksize(&attr, stacksize - 1));
/* ensure we can read back the values we just set */
zassert_ok(pthread_attr_getstacksize(&attr, &new_stacksize));
zassert_equal(new_stacksize, stacksize - 1);
can_create_thread(&attr);
}
if (IS_ENABLED(CONFIG_DYNAMIC_THREAD_ALLOC)) {
zassert_ok(pthread_attr_setstacksize(&attr, 2 * stacksize));
/* ensure we read back the same values as we specified */
zassert_ok(pthread_attr_getstacksize(&attr, &new_stacksize));
zassert_equal(new_stacksize, 2 * stacksize);
can_create_thread(&attr);
}
}
ZTEST(pthread_attr, test_pthread_attr_getinheritsched)
{
int inheritsched = BIOS_FOOD;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_getinheritsched(NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getinheritsched(NULL, &inheritsched), EINVAL);
zassert_equal(pthread_attr_getinheritsched(&uninit_attr, &inheritsched),
EINVAL);
}
zassert_equal(pthread_attr_getinheritsched(&attr, NULL), EINVAL);
}
zassert_ok(pthread_attr_getinheritsched(&attr, &inheritsched));
zassert_not_equal(inheritsched, BIOS_FOOD);
}
ZTEST(pthread_attr, test_pthread_attr_setinheritsched)
{
int inheritsched = PTHREAD_EXPLICIT_SCHED;
int new_inheritsched = PTHREAD_INHERIT_SCHED;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_setinheritsched(NULL, PTHREAD_EXPLICIT_SCHED),
EINVAL);
zassert_equal(pthread_attr_setinheritsched(NULL, inheritsched), EINVAL);
zassert_equal(pthread_attr_setinheritsched((pthread_attr_t *)&uninit_attr,
inheritsched), EINVAL);
}
zassert_equal(pthread_attr_setinheritsched(&attr, 3), EINVAL);
}
zassert_ok(pthread_attr_setscope(&attr, new_inheritsched));
zassert_ok(pthread_attr_getscope(&attr, &inheritsched));
zassert_equal(inheritsched, new_inheritsched);
}
ZTEST(pthread_attr, test_pthread_attr_large_stacksize)
{
size_t actual_size;
const size_t expect_size = BIT(CONFIG_POSIX_PTHREAD_ATTR_STACKSIZE_BITS);
if (pthread_attr_setstacksize(&attr, expect_size) != 0) {
TC_PRINT("Unable to allocate large stack of size %zu (skipping)\n", expect_size);
ztest_test_skip();
return;
}
zassert_ok(pthread_attr_getstacksize(&attr, &actual_size));
zassert_equal(actual_size, expect_size);
}
ZTEST(pthread_attr, test_pthread_attr_getdetachstate)
{
int detachstate;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_getdetachstate(NULL, NULL), EINVAL);
zassert_equal(pthread_attr_getdetachstate(NULL, &detachstate), EINVAL);
zassert_equal(pthread_attr_getdetachstate(&uninit_attr, &detachstate),
EINVAL);
}
zassert_equal(pthread_attr_getdetachstate(&attr, NULL), EINVAL);
}
/* default detachstate is joinable */
zassert_ok(pthread_attr_getdetachstate(&attr, &detachstate));
zassert_equal(detachstate, PTHREAD_CREATE_JOINABLE);
can_create_thread(&attr);
}
ZTEST(pthread_attr, test_pthread_attr_setdetachstate)
{
int detachstate = PTHREAD_CREATE_JOINABLE;
/* degenerate cases */
{
if (false) {
/* undefined behaviour */
zassert_equal(pthread_attr_setdetachstate(NULL, INVALID_DETACHSTATE),
EINVAL);
zassert_equal(pthread_attr_setdetachstate(NULL, detachstate), EINVAL);
zassert_equal(pthread_attr_setdetachstate((pthread_attr_t *)&uninit_attr,
detachstate),
EINVAL);
}
zassert_equal(pthread_attr_setdetachstate(&attr, INVALID_DETACHSTATE), EINVAL);
}
/* read back detachstate just written */
zassert_ok(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED));
zassert_ok(pthread_attr_getdetachstate(&attr, &detachstate));
zassert_equal(detachstate, PTHREAD_CREATE_DETACHED);
create_thread_common(&attr, true, false);
}
ZTEST(pthread_attr, test_pthread_attr_policy_and_priority_limits)
{
int pmin = -1;
int pmax = -1;
struct sched_param param;
static const int policies[] = {
SCHED_FIFO,
SCHED_RR,
SCHED_OTHER,
SCHED_INVALID,
};
static const char *const policy_names[] = {
"SCHED_FIFO",
"SCHED_RR",
"SCHED_OTHER",
"SCHED_INVALID",
};
static const bool policy_enabled[] = {
CONFIG_NUM_COOP_PRIORITIES > 0,
CONFIG_NUM_PREEMPT_PRIORITIES > 0,
CONFIG_NUM_PREEMPT_PRIORITIES > 0,
false,
};
static int nprio[] = {
CONFIG_NUM_COOP_PRIORITIES,
CONFIG_NUM_PREEMPT_PRIORITIES,
CONFIG_NUM_PREEMPT_PRIORITIES,
42,
};
const char *const prios[] = {"pmin", "pmax"};
BUILD_ASSERT(!(SCHED_INVALID == SCHED_FIFO || SCHED_INVALID == SCHED_RR ||
SCHED_INVALID == SCHED_OTHER),
"SCHED_INVALID is itself invalid");
ARRAY_FOR_EACH(policies, policy) {
/* get pmin and pmax for policies[policy] */
ARRAY_FOR_EACH(prios, i) {
errno = 0;
if (i == 0) {
pmin = sched_get_priority_min(policies[policy]);
param.sched_priority = pmin;
} else {
pmax = sched_get_priority_max(policies[policy]);
param.sched_priority = pmax;
}
if (policy == 3) {
/* invalid policy */
zassert_equal(-1, param.sched_priority);
zassert_equal(errno, EINVAL);
continue;
}
zassert_not_equal(-1, param.sched_priority,
"sched_get_priority_%s(%s) failed: %d",
i == 0 ? "min" : "max", policy_names[policy], errno);
zassert_ok(errno, "sched_get_priority_%s(%s) set errno to %s",
i == 0 ? "min" : "max", policy_names[policy], errno);
}
if (policy != 3) {
/* this will not work for SCHED_INVALID */
/*
* IEEE 1003.1-2008 Section 2.8.4
* conforming implementations should provide a range of at least 32
* priorities
*
* Note: we relax this requirement
*/
zassert_true(pmax > pmin, "pmax (%d) <= pmin (%d)", pmax, pmin,
"%s min/max inconsistency: pmin: %d pmax: %d",
policy_names[policy], pmin, pmax);
/*
* Getting into the weeds a bit (i.e. whitebox testing), Zephyr
* cooperative threads use [-CONFIG_NUM_COOP_PRIORITIES,-1] and
* preemptive threads use [0, CONFIG_NUM_PREEMPT_PRIORITIES - 1],
* where the more negative thread has the higher priority. Since we
* cannot map those directly (a return value of -1 indicates error),
* we simply map those to the positive space.
*/
zassert_equal(pmin, 0, "unexpected pmin for %s", policy_names[policy]);
zassert_equal(pmax, nprio[policy] - 1, "unexpected pmax for %s",
policy_names[policy]); /* test happy paths */
}
/* create threads with min and max priority levels for each policy */
ARRAY_FOR_EACH(prios, i) {
param.sched_priority = (i == 0) ? pmin : pmax;
if (!policy_enabled[policy]) {
zassert_not_ok(
pthread_attr_setschedpolicy(&attr, policies[policy]));
zassert_not_ok(
pthread_attr_setschedparam(&attr, ¶m),
"pthread_attr_setschedparam() failed for %s (%d) of %s",
prios[i], param.sched_priority, policy_names[policy]);
continue;
}
/* set policy */
zassert_ok(pthread_attr_setschedpolicy(&attr, policies[policy]),
"pthread_attr_setschedpolicy() failed for %s (%d) of %s",
prios[i], param.sched_priority, policy_names[policy]);
/* set priority */
zassert_ok(pthread_attr_setschedparam(&attr, ¶m),
"pthread_attr_setschedparam() failed for %s (%d) of %s",
prios[i], param.sched_priority, policy_names[policy]);
can_create_thread(&attr);
}
}
}
static void before(void *arg)
{
ARG_UNUSED(arg);
zassert_ok(pthread_attr_init(&attr));
/* TODO: pthread_attr_init() should be sufficient to initialize a thread by itself */
zassert_ok(pthread_attr_setstack(&attr, &static_thread_stack, STATIC_THREAD_STACK_SIZE));
attr_valid = true;
}
static void after(void *arg)
{
ARG_UNUSED(arg);
if (attr_valid) {
(void)pthread_attr_destroy(&attr);
attr_valid = false;
}
}
ZTEST_SUITE(pthread_attr, NULL, NULL, before, after, NULL);