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/*-------------------------------------------------------------------------
* C-Pluff, a plug-in framework for C
* Copyright 2007 Johannes Lehtinen
*
* 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.
*-----------------------------------------------------------------------*/
/** @file
* Serial execution implementation
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include "cpluff.h"
#include "internal.h"
/* ------------------------------------------------------------------------
* Data types
* ----------------------------------------------------------------------*/
/// A holder structure for a run function.
typedef struct run_func_t {
/// The run function
cp_run_func_t runfunc;
/// The registering plug-in instance
cp_plugin_t *plugin;
/// Whether currently in execution
int in_execution;
} run_func_t;
CP_C_API cp_status_t cp_run_function(cp_context_t *ctx, cp_run_func_t runfunc) {
lnode_t *node = NULL;
run_func_t *rf = NULL;
cp_status_t status = CP_OK;
CHECK_NOT_NULL(ctx);
CHECK_NOT_NULL(runfunc);
if (ctx->plugin == NULL) {
cpi_fatalf(_("Only plug-ins can register run functions."));
}
if (ctx->plugin->state != CP_PLUGIN_ACTIVE
&& ctx->plugin->state != CP_PLUGIN_STARTING) {
cpi_fatalf(_("Only starting or active plug-ins can register run functions."));
}
cpi_lock_context(ctx);
cpi_check_invocation(ctx, CPI_CF_STOP | CPI_CF_LOGGER, __func__);
do {
int found = 0;
lnode_t *n;
// Check if already registered
n = list_first(ctx->env->run_funcs);
while (n != NULL && !found) {
run_func_t *r = lnode_get(n);
if (runfunc == r->runfunc && ctx->plugin == r->plugin) {
found = 1;
}
n = list_next(ctx->env->run_funcs, n);
}
if (found) {
break;
}
// Allocate memory for a new run function entry
if ((rf = malloc(sizeof(run_func_t))) == NULL) {
status = CP_ERR_RESOURCE;
break;
}
if ((node = lnode_create(rf)) == NULL) {
status = CP_ERR_RESOURCE;
break;
}
// Initialize run function entry
memset(rf, 0, sizeof(run_func_t));
rf->runfunc = runfunc;
rf->plugin = ctx->plugin;
// Append the run function to queue
list_append(ctx->env->run_funcs, node);
if (ctx->env->run_wait == NULL) {
ctx->env->run_wait = node;
}
} while (0);
// Log error
if (status == CP_ERR_RESOURCE) {
cpi_error(ctx, N_("Could not register a run function due to insufficient memory."));
}
cpi_unlock_context(ctx);
// Free resources on error
if (status != CP_OK) {
if (node != NULL) {
lnode_destroy(node);
}
if (rf != NULL) {
free(rf);
}
}
return status;
}
CP_C_API void cp_run_plugins(cp_context_t *ctx) {
while (cp_run_plugins_step(ctx));
}
CP_C_API int cp_run_plugins_step(cp_context_t *ctx) {
int runnables;
CHECK_NOT_NULL(ctx);
cpi_lock_context(ctx);
if (ctx->env->run_wait != NULL) {
lnode_t *node = ctx->env->run_wait;
run_func_t *rf = lnode_get(node);
int rerun;
ctx->env->run_wait = list_next(ctx->env->run_funcs, node);
rf->in_execution = 1;
cpi_unlock_context(ctx);
rerun = rf->runfunc(rf->plugin->plugin_data);
cpi_lock_context(ctx);
rf->in_execution = 0;
list_delete(ctx->env->run_funcs, node);
if (rerun) {
list_append(ctx->env->run_funcs, node);
if (ctx->env->run_wait == NULL) {
ctx->env->run_wait = node;
}
} else {
lnode_destroy(node);
free(rf);
}
cpi_signal_context(ctx);
}
runnables = (ctx->env->run_wait != NULL);
cpi_unlock_context(ctx);
return runnables;
}
CP_HIDDEN void cpi_stop_plugin_run(cp_plugin_t *plugin) {
int stopped = 0;
cp_context_t *ctx;
CHECK_NOT_NULL(plugin);
ctx = plugin->context;
assert(cpi_is_context_locked(ctx));
while (!stopped) {
lnode_t *node;
stopped = 1;
node = list_first(ctx->env->run_funcs);
while (node != NULL) {
run_func_t *rf = lnode_get(node);
lnode_t *next_node = list_next(ctx->env->run_funcs, node);
if (rf->plugin == plugin) {
if (rf->in_execution) {
stopped = 0;
} else {
if (ctx->env->run_wait == node) {
ctx->env->run_wait = list_next(ctx->env->run_funcs, node);
}
list_delete(ctx->env->run_funcs, node);
lnode_destroy(node);
free(rf);
}
}
node = next_node;
}
// If some run functions were in execution, wait for them to finish
if (!stopped) {
cpi_wait_context(ctx);
}
}
}
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