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-rw-r--r--3rdparty/plibsys/src/pshm-amiga.c274
1 files changed, 274 insertions, 0 deletions
diff --git a/3rdparty/plibsys/src/pshm-amiga.c b/3rdparty/plibsys/src/pshm-amiga.c
new file mode 100644
index 0000000..4010ea2
--- /dev/null
+++ b/3rdparty/plibsys/src/pshm-amiga.c
@@ -0,0 +1,274 @@
+/*
+ * The MIT License
+ *
+ * Copyright (C) 2018 Alexander Saprykin <saprykin.spb@gmail.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * 'Software'), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "perror.h"
+#include "pmem.h"
+#include "psemaphore.h"
+#include "pshm.h"
+#include "pipc-private.h"
+
+#include <string.h>
+
+#include <exec/types.h>
+#include <proto/exec.h>
+
+#define P_SHM_NAMESPACE "pshm"
+#define P_SHM_SUFFIX "_p_shm_object"
+#define P_SHM_PRIV_SIZE (2 * sizeof (psize))
+
+struct PShm_ {
+ pboolean is_owner;
+ pchar *platform_key;
+ ppointer addr;
+ psize size;
+ PSemaphore *sem;
+ PShmAccessPerms perms;
+};
+
+static PErrorIPC pp_shm_get_ipc_error (puint32 err_code);
+static pboolean pp_shm_create_handle (PShm *shm, PError **error);
+
+static PErrorIPC
+pp_shm_get_ipc_error (puint32 err_code)
+{
+ if (err_code == ANMERROR_NOERROR)
+ return P_ERROR_IPC_NONE;
+ else if (err_code == ANMERROR_NOMEMORY)
+ return P_ERROR_IPC_NO_RESOURCES;
+ else if (err_code == ANMERROR_DUPLICATENAME)
+ return P_ERROR_IPC_EXISTS;
+ else if (err_code == ANMERROR_PARAMETER)
+ return P_ERROR_IPC_INVALID_ARGUMENT;
+ else
+ return P_ERROR_IPC_FAILED;
+}
+
+static pboolean
+pp_shm_create_handle (PShm *shm,
+ PError **error)
+{
+ ppointer mem_area;
+ puint32 err_code;
+ pboolean is_exists;
+
+ if (P_UNLIKELY (shm == NULL || shm->platform_key == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return FALSE;
+ }
+
+ IExec->Forbid ();
+
+ mem_area = IExec->FindNamedMemory (P_SHM_NAMESPACE, shm->platform_key);
+
+ if (mem_area == NULL) {
+ mem_area = IExec->AllocNamedMemoryTags (shm->size + P_SHM_PRIV_SIZE,
+ P_SHM_NAMESPACE,
+ shm->platform_key,
+ ANMT_Error, &err_code,
+ TAG_END);
+
+ if (P_UNLIKELY (mem_area == NULL)) {
+ IExec->Permit ();
+ p_error_set_error_p (error,
+ (pint) pp_shm_get_ipc_error (err_code),
+ (pint) err_code,
+ "Failed to call AllocNamedMemoryTags() to create memory segment");
+ return FALSE;
+ }
+
+ memset (mem_area, 0, shm->size + P_SHM_PRIV_SIZE);
+
+ /* Set size and counter */
+ *((psize *) mem_area) = shm->size;
+ *((psize *) mem_area + 1) = 1;
+
+ is_exists = FALSE;
+ } else {
+ *((psize *) mem_area + 1) += 1;
+
+ shm->size = *((psize *) mem_area);
+ is_exists = TRUE;
+ }
+
+ shm->addr = ((pchar *) mem_area) + P_SHM_PRIV_SIZE;
+
+ if (P_UNLIKELY ((shm->sem = p_semaphore_new (shm->platform_key, 1,
+ is_exists ? P_SEM_ACCESS_OPEN : P_SEM_ACCESS_CREATE,
+ error)) == NULL)) {
+ IExec->FreeNamedMemory (P_SHM_NAMESPACE, shm->platform_key);
+ IExec->Permit ();
+ return FALSE;
+ }
+
+ IExec->Permit ();
+
+ return TRUE;
+}
+
+P_LIB_API PShm *
+p_shm_new (const pchar *name,
+ psize size,
+ PShmAccessPerms perms,
+ PError **error)
+{
+ PShm *ret;
+ pchar *new_name;
+
+ if (P_UNLIKELY (name == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return NULL;
+ }
+
+ if (P_UNLIKELY ((ret = p_malloc0 (sizeof (PShm))) == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_NO_RESOURCES,
+ 0,
+ "Failed to allocate memory for shared segment");
+ return NULL;
+ }
+
+ if (P_UNLIKELY ((new_name = p_malloc0 (strlen (name) + strlen (P_SHM_SUFFIX) + 1)) == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_NO_RESOURCES,
+ 0,
+ "Failed to allocate memory for segment name");
+ p_shm_free (ret);
+ return NULL;
+ }
+
+ strcpy (new_name, name);
+ strcat (new_name, P_SHM_SUFFIX);
+
+ ret->platform_key = p_ipc_get_platform_key (new_name, FALSE);
+ ret->perms = perms;
+ ret->size = size;
+
+ p_free (new_name);
+
+ if (P_UNLIKELY (pp_shm_create_handle (ret, error) == FALSE)) {
+ p_shm_free (ret);
+ return NULL;
+ }
+
+ if (P_LIKELY (ret->size > size && size != 0))
+ ret->size = size;
+
+ return ret;
+}
+
+P_LIB_API void
+p_shm_take_ownership (PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return;
+
+ shm->is_owner = TRUE;
+ p_semaphore_take_ownership (shm->sem);
+}
+
+P_LIB_API void
+p_shm_free (PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return;
+
+ if (shm->addr != NULL) {
+ IExec->Forbid ();
+
+ *((psize *) shm->addr - 1) -= 1;
+
+ if (shm->is_owner || *((psize *) shm->addr - 1) == 0) {
+ p_semaphore_free (shm->sem);
+ shm->sem = NULL;
+
+ IExec->FreeNamedMemory (P_SHM_NAMESPACE, shm->platform_key);
+ }
+
+ IExec->Permit ();
+ }
+
+ shm->is_owner = FALSE;
+ shm->addr = NULL;
+ shm->size = 0;
+
+ if (P_LIKELY (shm->platform_key != NULL))
+ p_free (shm->platform_key);
+
+ p_free (shm);
+}
+
+P_LIB_API pboolean
+p_shm_lock (PShm *shm,
+ PError **error)
+{
+ if (P_UNLIKELY (shm == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return FALSE;
+ }
+
+ return p_semaphore_acquire (shm->sem, error);
+}
+
+P_LIB_API pboolean
+p_shm_unlock (PShm *shm,
+ PError **error)
+{
+ if (P_UNLIKELY (shm == NULL)) {
+ p_error_set_error_p (error,
+ (pint) P_ERROR_IPC_INVALID_ARGUMENT,
+ 0,
+ "Invalid input argument");
+ return FALSE;
+ }
+
+ return p_semaphore_release (shm->sem, error);
+}
+
+P_LIB_API ppointer
+p_shm_get_address (const PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return NULL;
+
+ return shm->addr;
+}
+
+P_LIB_API psize
+p_shm_get_size (const PShm *shm)
+{
+ if (P_UNLIKELY (shm == NULL))
+ return 0;
+
+ return shm->size;
+}
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