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/* This is the file to support single-threading.
* We initialize the global data structure and the global access variable.
*/
#include "regina_c.h"
#include "rexxsaa.h"
#define DONT_TYPEDEF_PFN
#include "rexx.h"
typedef struct _MT_mem {
struct _MT_mem *prev;
struct _MT_mem *next;
/* real data follows here */
} MT_mem;
typedef struct { /* mt_tsd: static variables of this module (thread-safe) */
MT_mem *mem_base;
} mt_tsd_t; /* thread-specific but only needed by this module. see
* ReginaInitializeThread
*/
int __regina_tsd_initialized = 0;
tsd_t __regina_tsd = {0,}; /* Be sure the var is initialized here */
/* Lowest level memory allocation function for normal circumstances. */
static void *MTMalloc(const tsd_t *TSD,size_t size)
{
mt_tsd_t *mt;
MT_mem *new = malloc(size + sizeof(MT_mem));
if (new == NULL) /* may happen. errors are detected in the above layers */
return(NULL);
mt = TSD->mt_tsd;
new->prev = NULL;
new->next = mt->mem_base;
if (mt->mem_base)
mt->mem_base->prev = new;
mt->mem_base = new;
return(new + 1); /* jump over the head */
}
/* Lowest level memory deallocation function for normal circumstances. */
static void MTFree(const tsd_t *TSD,void *chunk)
{
mt_tsd_t *mt = TSD->mt_tsd;
MT_mem *this;
/*
* Just in case...
*/
if ( chunk == NULL)
return;
this = chunk;
this--; /* Go to the header of the chunk */
if (this->prev)
{
if (this->prev->next != this)
return;
}
if (this->next)
{
if (this->next->prev != this)
return;
}
/* This is a chunk allocated by MTMalloc */
if (this->prev)
this->prev->next = this->next;
if (this->next)
this->next->prev = this->prev;
if (this == mt->mem_base)
mt->mem_base = this->next;
/* Last not least we set the pointers to NULL. This prevents a double-free*/
this->next = NULL;
this->prev = NULL;
free(this);
}
/* Lowest level exit handler. Use this indirection to prevent errors. */
static void MTExit(int code)
{
exit(code);
}
int IfcReginaCleanup( VOID )
{
tsd_t *TSD = &__regina_tsd;
mt_tsd_t *mt;
MT_mem *chunk;
if (!__regina_tsd_initialized)
return 0;
__regina_tsd_initialized = 0;
deinit_rexxsaa(TSD);
mt = TSD->mt_tsd;
if (mt)
{
while ((chunk = mt->mem_base) != NULL)
{
TSD->MTFree(TSD,chunk + 1);
if (mt->mem_base == chunk)
break; /* something goes wrong. Don't run into an endless loop */
}
}
if (mt)
free(mt);
memset( TSD, 0, sizeof(tsd_t) );
return 1;
}
tsd_t *ReginaInitializeProcess(void)
{
int OK;
if (__regina_tsd_initialized)
return(&__regina_tsd);
__regina_tsd_initialized = 1;
/* Set up the current (single) tsd_t:*/
/* Default all values to zero */
memset(&__regina_tsd,0,sizeof(__regina_tsd));
__regina_tsd.MTMalloc = MTMalloc;
__regina_tsd.MTFree = MTFree;
__regina_tsd.MTExit = MTExit;
/* Since the local data structure contains a memory chain for the memory
* management we initialize it first.
*/
if ((__regina_tsd.mt_tsd = malloc(sizeof(mt_tsd_t))) == NULL)
return(NULL); /* This is a catastrophy */
memset(__regina_tsd.mt_tsd,0,sizeof(mt_tsd_t));
OK = init_memory(&__regina_tsd); /* Initialize the memory module FIRST*/
/* Without the initial memory we don't have ANY chance! */
if (!OK)
return(NULL);
OK |= init_vars(&__regina_tsd); /* Initialize the variable module */
OK |= init_stacks(&__regina_tsd); /* Initialize the stack module */
OK |= init_filetable(&__regina_tsd); /* Initialize the files module */
OK |= init_math(&__regina_tsd); /* Initialize the math module */
OK |= init_spec_vars(&__regina_tsd); /* Initialize the interprt module */
OK |= init_tracing(&__regina_tsd); /* Initialize the tracing module */
OK |= init_builtin(&__regina_tsd); /* Initialize the builtin module */
OK |= init_client(&__regina_tsd); /* Initialize the client module */
OK |= init_library(&__regina_tsd); /* Initialize the library module */
OK |= init_rexxsaa(&__regina_tsd); /* Initialize the rexxsaa module */
OK |= init_shell(&__regina_tsd); /* Initialize the shell module */
OK |= init_envir(&__regina_tsd); /* Initialize the envir module */
OK |= init_expr(&__regina_tsd); /* Initialize the expr module */
OK |= init_error(&__regina_tsd); /* Initialize the error module */
#ifdef VMS
OK |= init_vms(&__regina_tsd); /* Initialize the vmscmd module */
OK |= init_vmf(&__regina_tsd); /* Initialize the vmsfuncs module */
#endif
OK |= init_arexxf(&__regina_tsd); /* Initialize the arxfuncs modules */
__regina_tsd.loopcnt = 1; /* stupid r2perl-module */
__regina_tsd.traceparse = -1;
__regina_tsd.thread_id = 1;
if (!OK)
exiterror( ERR_STORAGE_EXHAUSTED, 0 ) ;
return(&__regina_tsd);
}
#ifdef TRACK_TSD_USAGE
/* We may want to check the counts of calls to __regina_get_tsd() which may do
* MUCH work on different platforms. We do some not optimizable work here.
* If you really wanna track down all calls to figure out WHERE to
* optimize try under a GNU friendly system:
* 1) In Makefile: Add "-pg -a" to the variable called "CFLAGS".
* 2) "make rexx" (Other targets might not work)
* 3) "./rexx whatyoulike.rexx"
* 4) "gprof rexx >usage.lst"
* 5) look at usage.lst for occurances of "WorkHeavy".
*/
volatile int __regina_Calls = 300; /* factor to get a "feel" for multithreading */
volatile int __regina_Point = 1;
void __regina_Nop(void)
{
__regina_Point = 2;
}
/* WorkHeavy does some work and returns the correct thread-specific data. */
tsd_t *__regina_WorkHeavy(void)
{
int todo = __regina_Calls;
while (todo--)
__regina_Nop();
return(&__regina_tsd);
}
#endif
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