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[219.123.138.129]) by smtp.gmail.com with ESMTPSA id l9sm2198899pjz.11.2020.10.06.02.46.19 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 06 Oct 2020 02:46:19 -0700 (PDT) Received: by earth-mac.local (Postfix, from userid 501) id B8DA420390F516; Tue, 6 Oct 2020 18:46:17 +0900 (JST) From: Hajime Tazaki To: linux-um@lists.infradead.org, jdike@addtoit.com, richard@nod.at, anton.ivanov@cambridgegreys.com Cc: tavi.purdila@gmail.com, retrage01@gmail.com, linux-kernel-library@freelists.org, linux-arch@vger.kernel.org, Hajime Tazaki Subject: [RFC v7 19/21] um: host: posix host operations Date: Tue, 6 Oct 2020 18:44:28 +0900 Message-Id: <63a3d215a0e430152020b3ef2d1f850fa8bb23c4.1601960644.git.thehajime@gmail.com> X-Mailer: git-send-email 2.20.1 (Apple Git-117) In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-arch@vger.kernel.org This commit implements LKL host operations for POSIX hosts. The operations are implemented to be portable in various POSIX OSs. Signed-off-by: Octavian Purdila Signed-off-by: Hajime Tazaki --- tools/um/lib/Build | 2 + tools/um/lib/posix-host.c | 292 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 294 insertions(+) create mode 100644 tools/um/lib/posix-host.c diff --git a/tools/um/lib/Build b/tools/um/lib/Build index fc967af4104a..dddff26a3b4e 100644 --- a/tools/um/lib/Build +++ b/tools/um/lib/Build @@ -1,4 +1,6 @@ include $(objtree)/include/config/auto.conf +CFLAGS_posix-host.o += -D_FILE_OFFSET_BITS=64 liblinux-$(CONFIG_UMMODE_LIB) += utils.o +liblinux-$(CONFIG_UMMODE_LIB) += posix-host.o liblinux-$(CONFIG_UMMODE_LIB) += jmp_buf.o diff --git a/tools/um/lib/posix-host.c b/tools/um/lib/posix-host.c new file mode 100644 index 000000000000..b6b5b2902254 --- /dev/null +++ b/tools/um/lib/posix-host.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include +#include +#include +#include +#include "jmp_buf.h" + +/* Let's see if the host has semaphore.h */ +#include + +#ifdef _POSIX_SEMAPHORES +#include +/* TODO(pscollins): We don't support fork() for now, but maybe one day + * we will? + */ +#define SHARE_SEM 0 +#endif /* _POSIX_SEMAPHORES */ + + +struct lkl_mutex { + pthread_mutex_t mutex; +}; + +struct lkl_sem { +#ifdef _POSIX_SEMAPHORES + sem_t sem; +#else + pthread_mutex_t lock; + int count; + pthread_cond_t cond; +#endif /* _POSIX_SEMAPHORES */ +}; + +struct lkl_tls_key { + pthread_key_t key; +}; + +static void print(const char *str, int len) +{ + int ret __attribute__((unused)); + + ret = write(STDOUT_FILENO, str, len); +} + +static void panic(void) +{ + assert(0); +} + +#define WARN_UNLESS(exp) do { \ + if (exp < 0) \ + lkl_printf("%s: %s\n", #exp, strerror(errno)); \ + } while (0) + +static int _warn_pthread(int ret, char *str_exp) +{ + if (ret > 0) + lkl_printf("%s: %s\n", str_exp, strerror(ret)); + + return ret; +} + + +/* pthread_* functions use the reverse convention */ +#define WARN_PTHREAD(exp) _warn_pthread(exp, #exp) + +static struct lkl_sem *sem_alloc(int count) +{ + struct lkl_sem *sem; + + sem = malloc(sizeof(*sem)); + if (!sem) + return NULL; + +#ifdef _POSIX_SEMAPHORES + if (sem_init(&sem->sem, SHARE_SEM, count) < 0) { + lkl_printf("sem_init: %s\n", strerror(errno)); + free(sem); + return NULL; + } +#else + pthread_mutex_init(&sem->lock, NULL); + sem->count = count; + WARN_PTHREAD(pthread_cond_init(&sem->cond, NULL)); +#endif /* _POSIX_SEMAPHORES */ + + return sem; +} + +static void sem_free(struct lkl_sem *sem) +{ +#ifdef _POSIX_SEMAPHORES + WARN_UNLESS(sem_destroy(&sem->sem)); +#else + WARN_PTHREAD(pthread_cond_destroy(&sem->cond)); + WARN_PTHREAD(pthread_mutex_destroy(&sem->lock)); +#endif /* _POSIX_SEMAPHORES */ + free(sem); +} + +static void sem_up(struct lkl_sem *sem) +{ +#ifdef _POSIX_SEMAPHORES + WARN_UNLESS(sem_post(&sem->sem)); +#else + WARN_PTHREAD(pthread_mutex_lock(&sem->lock)); + sem->count++; + if (sem->count > 0) + WARN_PTHREAD(pthread_cond_signal(&sem->cond)); + WARN_PTHREAD(pthread_mutex_unlock(&sem->lock)); +#endif /* _POSIX_SEMAPHORES */ + +} + +static void sem_down(struct lkl_sem *sem) +{ +#ifdef _POSIX_SEMAPHORES + int err; + + do { + err = sem_wait(&sem->sem); + } while (err < 0 && errno == EINTR); + if (err < 0 && errno != EINTR) + lkl_printf("sem_wait: %s\n", strerror(errno)); +#else + WARN_PTHREAD(pthread_mutex_lock(&sem->lock)); + while (sem->count <= 0) + WARN_PTHREAD(pthread_cond_wait(&sem->cond, &sem->lock)); + sem->count--; + WARN_PTHREAD(pthread_mutex_unlock(&sem->lock)); +#endif /* _POSIX_SEMAPHORES */ +} + +static struct lkl_mutex *mutex_alloc(int recursive) +{ + struct lkl_mutex *_mutex = malloc(sizeof(struct lkl_mutex)); + pthread_mutex_t *mutex = NULL; + pthread_mutexattr_t attr; + + if (!_mutex) + return NULL; + + mutex = &_mutex->mutex; + WARN_PTHREAD(pthread_mutexattr_init(&attr)); + + /* PTHREAD_MUTEX_ERRORCHECK is *very* useful for debugging, + * but has some overhead, so we provide an option to turn it + * off. + */ +#ifdef DEBUG + if (!recursive) + WARN_PTHREAD(pthread_mutexattr_settype( + &attr, PTHREAD_MUTEX_ERRORCHECK)); +#endif /* DEBUG */ + + if (recursive) + WARN_PTHREAD(pthread_mutexattr_settype( + &attr, PTHREAD_MUTEX_RECURSIVE)); + + WARN_PTHREAD(pthread_mutex_init(mutex, &attr)); + + return _mutex; +} + +static void mutex_lock(struct lkl_mutex *mutex) +{ + WARN_PTHREAD(pthread_mutex_lock(&mutex->mutex)); +} + +static void mutex_unlock(struct lkl_mutex *_mutex) +{ + pthread_mutex_t *mutex = &_mutex->mutex; + + WARN_PTHREAD(pthread_mutex_unlock(mutex)); +} + +static void mutex_free(struct lkl_mutex *_mutex) +{ + pthread_mutex_t *mutex = &_mutex->mutex; + + WARN_PTHREAD(pthread_mutex_destroy(mutex)); + free(_mutex); +} + +static lkl_thread_t thread_create(void* (*fn)(void *), void *arg) +{ + pthread_t thread; + + if (WARN_PTHREAD(pthread_create(&thread, NULL, fn, arg))) + return 0; + else + return (lkl_thread_t) thread; +} + +static void thread_detach(void) +{ + WARN_PTHREAD(pthread_detach(pthread_self())); +} + +static void thread_exit(void) +{ + pthread_exit(NULL); +} + +static int thread_join(lkl_thread_t tid) +{ + if (WARN_PTHREAD(pthread_join((pthread_t)tid, NULL))) + return (-1); + else + return 0; +} + +static lkl_thread_t thread_self(void) +{ + return (lkl_thread_t)pthread_self(); +} + +static int thread_equal(lkl_thread_t a, lkl_thread_t b) +{ + return pthread_equal((pthread_t)a, (pthread_t)b); +} + +static long _gettid(void) +{ +#ifdef __FreeBSD__ + return (long)pthread_self(); +#else + return syscall(SYS_gettid); +#endif +} + +static struct lkl_tls_key *tls_alloc(void (*destructor)(void *)) +{ + struct lkl_tls_key *ret = malloc(sizeof(struct lkl_tls_key)); + + if (WARN_PTHREAD(pthread_key_create(&ret->key, destructor))) { + free(ret); + return NULL; + } + return ret; +} + +static void tls_free(struct lkl_tls_key *key) +{ + WARN_PTHREAD(pthread_key_delete(key->key)); + free(key); +} + +static int tls_set(struct lkl_tls_key *key, void *data) +{ + if (WARN_PTHREAD(pthread_setspecific(key->key, data))) + return (-1); + return 0; +} + +static void *tls_get(struct lkl_tls_key *key) +{ + return pthread_getspecific(key->key); +} + +struct lkl_host_operations lkl_host_ops = { + .panic = panic, + .print = print, + .mem_alloc = (void *)malloc, + .mem_free = free, + .thread_create = thread_create, + .thread_detach = thread_detach, + .thread_exit = thread_exit, + .thread_join = thread_join, + .thread_self = thread_self, + .thread_equal = thread_equal, + .sem_alloc = sem_alloc, + .sem_free = sem_free, + .sem_up = sem_up, + .sem_down = sem_down, + .mutex_alloc = mutex_alloc, + .mutex_free = mutex_free, + .mutex_lock = mutex_lock, + .mutex_unlock = mutex_unlock, + .gettid = _gettid, + .tls_alloc = tls_alloc, + .tls_free = tls_free, + .tls_set = tls_set, + .tls_get = tls_get, + .jmp_buf_set = jmp_buf_set, + .jmp_buf_longjmp = jmp_buf_longjmp, +}; + -- 2.21.0 (Apple Git-122.2)