diff mbox series

[v18,1/8] eal: add basic threading functions

Message ID 1636594425-9692-2-git-send-email-navasile@linux.microsoft.com (mailing list archive)
State Superseded
Delegated to: David Marchand
Headers show
Series eal: Add EAL API for threading | expand

Checks

Context Check Description
ci/checkpatch warning coding style issues

Commit Message

Narcisa Ana Maria Vasile Nov. 11, 2021, 1:33 a.m. UTC
From: Narcisa Vasile <navasile@microsoft.com>

Use a portable, type-safe representation for the thread identifier.
Add functions for comparing thread ids and obtaining the thread id
for the current thread.

Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
---
 lib/eal/common/meson.build            |  1 +
 lib/eal/{unix => common}/rte_thread.c | 57 ++++++++++++++++----------
 lib/eal/include/rte_thread.h          | 53 ++++++++++++++++++------
 lib/eal/unix/meson.build              |  1 -
 lib/eal/version.map                   |  3 ++
 lib/eal/windows/rte_thread.c          | 58 +++++++++++++++++----------
 6 files changed, 117 insertions(+), 56 deletions(-)
 rename lib/eal/{unix => common}/rte_thread.c (66%)

Comments

Narcisa Ana Maria Vasile April 12, 2022, 6 p.m. UTC | #1
On Wed, Nov 10, 2021 at 05:33:38PM -0800, Narcisa Ana Maria Vasile wrote:
> From: Narcisa Vasile <navasile@microsoft.com>
> 
> Use a portable, type-safe representation for the thread identifier.
> Add functions for comparing thread ids and obtaining the thread id
> for the current thread.
> 
> Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
> ---

Abandoning this patch series.
It is superseded by the thread patches sent by Tyler.
diff mbox series

Patch

diff --git a/lib/eal/common/meson.build b/lib/eal/common/meson.build
index 917758cc65..6bdc9cd854 100644
--- a/lib/eal/common/meson.build
+++ b/lib/eal/common/meson.build
@@ -52,5 +52,6 @@  if not is_windows
             'hotplug_mp.c',
             'malloc_mp.c',
             'rte_keepalive.c',
+            'rte_thread.c'
     )
 endif
diff --git a/lib/eal/unix/rte_thread.c b/lib/eal/common/rte_thread.c
similarity index 66%
rename from lib/eal/unix/rte_thread.c
rename to lib/eal/common/rte_thread.c
index c72d619ec1..92a7451b0a 100644
--- a/lib/eal/unix/rte_thread.c
+++ b/lib/eal/common/rte_thread.c
@@ -1,5 +1,6 @@ 
 /* SPDX-License-Identifier: BSD-3-Clause
  * Copyright 2021 Mellanox Technologies, Ltd
+ * Copyright(c) 2021 Microsoft Corporation
  */
 
 #include <errno.h>
@@ -16,25 +17,41 @@  struct eal_tls_key {
 	pthread_key_t thread_index;
 };
 
+rte_thread_t
+rte_thread_self(void)
+{
+	rte_thread_t thread_id;
+
+	thread_id.opaque_id = (uintptr_t)pthread_self();
+
+	return thread_id;
+}
+
+int
+rte_thread_equal(rte_thread_t t1, rte_thread_t t2)
+{
+	return pthread_equal((pthread_t)t1.opaque_id, (pthread_t)t2.opaque_id);
+}
+
 int
 rte_thread_key_create(rte_thread_key *key, void (*destructor)(void *))
 {
 	int err;
+	rte_thread_key k;
 
-	*key = malloc(sizeof(**key));
-	if ((*key) == NULL) {
+	k = malloc(sizeof(*k));
+	if (k == NULL) {
 		RTE_LOG(DEBUG, EAL, "Cannot allocate TLS key.\n");
-		rte_errno = ENOMEM;
-		return -1;
+		return EINVAL;
 	}
-	err = pthread_key_create(&((*key)->thread_index), destructor);
-	if (err) {
+	err = pthread_key_create(&(k->thread_index), destructor);
+	if (err != 0) {
 		RTE_LOG(DEBUG, EAL, "pthread_key_create failed: %s\n",
 			 strerror(err));
-		free(*key);
-		rte_errno = ENOEXEC;
-		return -1;
+		free(k);
+		return err;
 	}
+	*key = k;
 	return 0;
 }
 
@@ -43,18 +60,16 @@  rte_thread_key_delete(rte_thread_key key)
 {
 	int err;
 
-	if (!key) {
+	if (key == NULL) {
 		RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n");
-		rte_errno = EINVAL;
-		return -1;
+		return EINVAL;
 	}
 	err = pthread_key_delete(key->thread_index);
-	if (err) {
+	if (err != 0) {
 		RTE_LOG(DEBUG, EAL, "pthread_key_delete failed: %s\n",
 			 strerror(err));
 		free(key);
-		rte_errno = ENOEXEC;
-		return -1;
+		return err;
 	}
 	free(key);
 	return 0;
@@ -65,17 +80,15 @@  rte_thread_value_set(rte_thread_key key, const void *value)
 {
 	int err;
 
-	if (!key) {
+	if (key == NULL) {
 		RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n");
-		rte_errno = EINVAL;
-		return -1;
+		return EINVAL;
 	}
 	err = pthread_setspecific(key->thread_index, value);
-	if (err) {
+	if (err != 0) {
 		RTE_LOG(DEBUG, EAL, "pthread_setspecific failed: %s\n",
 			strerror(err));
-		rte_errno = ENOEXEC;
-		return -1;
+		return err;
 	}
 	return 0;
 }
@@ -83,7 +96,7 @@  rte_thread_value_set(rte_thread_key key, const void *value)
 void *
 rte_thread_value_get(rte_thread_key key)
 {
-	if (!key) {
+	if (key == NULL) {
 		RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n");
 		rte_errno = EINVAL;
 		return NULL;
diff --git a/lib/eal/include/rte_thread.h b/lib/eal/include/rte_thread.h
index 8be8ed8f36..c9cdeb07aa 100644
--- a/lib/eal/include/rte_thread.h
+++ b/lib/eal/include/rte_thread.h
@@ -1,6 +1,8 @@ 
 /* SPDX-License-Identifier: BSD-3-Clause
  * Copyright(c) 2021 Mellanox Technologies, Ltd
+ * Copyright(c) 2021 Microsoft Corporation
  */
+#include <stdint.h>
 
 #include <rte_os.h>
 #include <rte_compat.h>
@@ -20,11 +22,45 @@ 
 extern "C" {
 #endif
 
+#include <sched.h>
+
+/**
+ * Thread id descriptor.
+ */
+typedef struct rte_thread_tag {
+	uintptr_t opaque_id; /**< thread identifier */
+} rte_thread_t;
+
 /**
  * TLS key type, an opaque pointer.
  */
 typedef struct eal_tls_key *rte_thread_key;
 
+/**
+ * Get the id of the calling thread.
+ *
+ * @return
+ *   Return the thread id of the calling thread.
+ */
+__rte_experimental
+rte_thread_t rte_thread_self(void);
+
+/**
+ * Check if 2 thread ids are equal.
+ *
+ * @param t1
+ *   First thread id.
+ *
+ * @param t2
+ *   Second thread id.
+ *
+ * @return
+ *   If the ids are equal, return nonzero.
+ *   Otherwise, return 0.
+ */
+__rte_experimental
+int rte_thread_equal(rte_thread_t t1, rte_thread_t t2);
+
 #ifdef RTE_HAS_CPUSET
 
 /**
@@ -63,9 +99,7 @@  void rte_thread_get_affinity(rte_cpuset_t *cpusetp);
  *
  * @return
  *   On success, zero.
- *   On failure, a negative number and an error number is set in rte_errno.
- *   rte_errno can be: ENOMEM  - Memory allocation error.
- *                     ENOEXEC - Specific OS error.
+ *   On failure, return a positive errno-style error number.
  */
 
 __rte_experimental
@@ -80,9 +114,7 @@  int rte_thread_key_create(rte_thread_key *key,
  *
  * @return
  *   On success, zero.
- *   On failure, a negative number and an error number is set in rte_errno.
- *   rte_errno can be: EINVAL  - Invalid parameter passed.
- *                     ENOEXEC - Specific OS error.
+ *   On failure, return a positive errno-style error number.
  */
 __rte_experimental
 int rte_thread_key_delete(rte_thread_key key);
@@ -97,9 +129,7 @@  int rte_thread_key_delete(rte_thread_key key);
  *
  * @return
  *   On success, zero.
- *   On failure, a negative number and an error number is set in rte_errno.
- *   rte_errno can be: EINVAL  - Invalid parameter passed.
- *                     ENOEXEC - Specific OS error.
+ *   On failure, return a positive errno-style error number.
  */
 __rte_experimental
 int rte_thread_value_set(rte_thread_key key, const void *value);
@@ -112,9 +142,8 @@  int rte_thread_value_set(rte_thread_key key, const void *value);
  *
  * @return
  *   On success, value data pointer (can also be NULL).
- *   On failure, NULL and an error number is set in rte_errno.
- *   rte_errno can be: EINVAL  - Invalid parameter passed.
- *                     ENOEXEC - Specific OS error.
+ *   On failure, NULL and a positive error number is set in rte_errno.
+ *
  */
 __rte_experimental
 void *rte_thread_value_get(rte_thread_key key);
diff --git a/lib/eal/unix/meson.build b/lib/eal/unix/meson.build
index e3ecd3e956..cb6d233721 100644
--- a/lib/eal/unix/meson.build
+++ b/lib/eal/unix/meson.build
@@ -6,5 +6,4 @@  sources += files(
         'eal_unix_memory.c',
         'eal_unix_timer.c',
         'eal_firmware.c',
-        'rte_thread.c',
 )
diff --git a/lib/eal/version.map b/lib/eal/version.map
index ab28c22791..24e9747795 100644
--- a/lib/eal/version.map
+++ b/lib/eal/version.map
@@ -420,6 +420,9 @@  EXPERIMENTAL {
 	rte_intr_instance_free;
 	rte_intr_type_get;
 	rte_intr_type_set;
+
+	rte_thread_self;
+	rte_thread_equal;
 };
 
 INTERNAL {
diff --git a/lib/eal/windows/rte_thread.c b/lib/eal/windows/rte_thread.c
index 667287c387..26c8dd4ebe 100644
--- a/lib/eal/windows/rte_thread.c
+++ b/lib/eal/windows/rte_thread.c
@@ -1,5 +1,6 @@ 
 /* SPDX-License-Identifier: BSD-3-Clause
  * Copyright 2021 Mellanox Technologies, Ltd
+ * Copyright(c) 2021 Microsoft Corporation
  */
 
 #include <rte_common.h>
@@ -11,22 +12,38 @@  struct eal_tls_key {
 	DWORD thread_index;
 };
 
+rte_thread_t
+rte_thread_self(void)
+{
+	rte_thread_t thread_id;
+
+	thread_id.opaque_id = GetCurrentThreadId();
+
+	return thread_id;
+}
+
+int
+rte_thread_equal(rte_thread_t t1, rte_thread_t t2)
+{
+	return t1.opaque_id == t2.opaque_id;
+}
+
 int
 rte_thread_key_create(rte_thread_key *key,
 		__rte_unused void (*destructor)(void *))
 {
+	int ret;
+
 	*key = malloc(sizeof(**key));
 	if ((*key) == NULL) {
 		RTE_LOG(DEBUG, EAL, "Cannot allocate TLS key.\n");
-		rte_errno = ENOMEM;
-		return -1;
+		return ENOMEM;
 	}
 	(*key)->thread_index = TlsAlloc();
 	if ((*key)->thread_index == TLS_OUT_OF_INDEXES) {
-		RTE_LOG_WIN32_ERR("TlsAlloc()");
+		ret = thread_log_last_error("TlsAlloc()");
 		free(*key);
-		rte_errno = ENOEXEC;
-		return -1;
+		return ret;
 	}
 	return 0;
 }
@@ -34,16 +51,16 @@  rte_thread_key_create(rte_thread_key *key,
 int
 rte_thread_key_delete(rte_thread_key key)
 {
-	if (!key) {
+	int ret;
+
+	if (key == NULL) {
 		RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n");
-		rte_errno = EINVAL;
-		return -1;
+		return EINVAL;
 	}
 	if (!TlsFree(key->thread_index)) {
-		RTE_LOG_WIN32_ERR("TlsFree()");
+		ret = thread_log_last_error("TlsFree()");
 		free(key);
-		rte_errno = ENOEXEC;
-		return -1;
+		return ret;
 	}
 	free(key);
 	return 0;
@@ -54,17 +71,14 @@  rte_thread_value_set(rte_thread_key key, const void *value)
 {
 	char *p;
 
-	if (!key) {
+	if (key == NULL) {
 		RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n");
-		rte_errno = EINVAL;
-		return -1;
+		return EINVAL;
 	}
 	/* discard const qualifier */
 	p = (char *) (uintptr_t) value;
 	if (!TlsSetValue(key->thread_index, p)) {
-		RTE_LOG_WIN32_ERR("TlsSetValue()");
-		rte_errno = ENOEXEC;
-		return -1;
+		return thread_log_last_error("TlsSetValue()");
 	}
 	return 0;
 }
@@ -73,16 +87,18 @@  void *
 rte_thread_value_get(rte_thread_key key)
 {
 	void *output;
+	DWORD ret = 0;
 
-	if (!key) {
+	if (key == NULL) {
 		RTE_LOG(DEBUG, EAL, "Invalid TLS key.\n");
 		rte_errno = EINVAL;
 		return NULL;
 	}
 	output = TlsGetValue(key->thread_index);
-	if (GetLastError() != ERROR_SUCCESS) {
-		RTE_LOG_WIN32_ERR("TlsGetValue()");
-		rte_errno = ENOEXEC;
+	ret = GetLastError();
+	if (ret != 0) {
+		RTE_LOG(DEBUG, EAL, "GetLastError()=%lu: TlsGetValue()\n", ret);
+		rte_errno = thread_translate_win32_error(ret);
 		return NULL;
 	}
 	return output;