I need to send a message from Main thread to my Created Thread using WinAPI and Ring Buffer.
I defined structures and wrote functions for my Ring buffer. Ring Buffer - it contains head, tail, size and pointer to the structure Descriptor which has length of Data and data itself. As I need to send 2 parameters to CreateThread function, I created the third structure ThreadParams to keep 2 parameters.
I want to leave this structures how they are now, not changeable.
typedef struct _Descriptor
{
uint32_t dataLen;
void * data;
} Descriptor;
typedef struct _ringBuffer
{
Descriptor *bufferData;
int head;
int tail;
int size;
} ringBuffer;
typedef struct _ThreadParams
{
void * ptr1;
void * ptr2;
} ThreadParams;
There are my realisations of Ring Buffer functions:
void bufferFree(ringBuffer *buffer)
{
free(buffer->bufferData);
}
void ringInitialization(ringBuffer *buffer, int size)
{
buffer->size = size;
buffer->head = 0;
buffer->tail = 0;
buffer->bufferData = (Descriptor*)malloc(sizeof(Descriptor) * size);
}
int pushBack(ringBuffer *buffer, void * data) // fill buffer
{
buffer->bufferData[buffer->tail++] = *(Descriptor*)data;
if (buffer->tail == buffer->size)
{
buffer->tail = 0;
}
return 0;
}
int popFront(ringBuffer *buffer)
{
if (buffer->head != buffer->tail)
{
buffer->head++;
if (buffer->head == buffer->size)
{
buffer->head = 0;
}
}
return 0;
}
My main: I checked that I can send a few bytes (the memory is shared between threads), now I need to send a big message (> BUFF_SIZE) though Ring Buffer what I'm trying to do in while() cycle. Here is the question: how should I do it? My thing doesn't work because I catch an exception in printf() function (memory acces violation).
#include <stdio.h>
#include <stdlib.h>
#include <conio.h>
#include <windows.h>
#include <strsafe.h>
#include <stdint.h>
#define RING_SIZE 256
#define BUFFER_SIZE 1024
DWORD WINAPI HandleSendThread(LPVOID params);
uint8_t * getPointer(uint8_t *buffer, uint32_t index)
{
uint8_t * ptr = ((uint8_t*)buffer) + index * BUFFER_SIZE;
return ptr;
}
int main(int argc, char * argv[])
{
//Descriptor * ringData = (Descriptor *)malloc(sizeof(Descriptor) * RING_SIZE);
ringBuffer ring;
ringInitialization(&ring, RING_SIZE);
void * packetBuffer = malloc(BUFFER_SIZE * RING_SIZE);
uint8_t * currentBuffer = getPointer(packetBuffer, 0);
uint8_t * str = "Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they were perfectly normal, thank you very much. They were the last people you'd expect to be involved in anything strange or mysterious, because they just didn't hold with such nonsense. Mr.Dursley was the director of a firm called Grunnings, which made drills.He was a big, beefy man with hardly any neck, although he did have a very large mustache.Mrs.Dursley was thin and blonde and had nearly twice the usual amount of neck, which came in very useful as she spent so much of her time craning over garden fences, spying on the neighbors.The Dursleys had a small son called Dudley and in their opinion there was no finer boy anywhere.";
strcpy(currentBuffer, str);
ring.bufferData[0].data = currentBuffer;
ring.bufferData[0].dataLen = strlen(str);
int currentSize = 0;
int ringSize = RING_SIZE;
while(ring.bufferData[0].data != '\0')
{
for (int i = currentSize; i < ringSize; i + RING_SIZE)
{
pushBack(&ring, currentBuffer);
printf("h = %s, tail = %s, dataBuffer = %s\n", (char*)ring.head, (char*)ring.tail, (char*)ring.bufferData[i].data);
}
currentSize = ringSize;
ringSize = 2 * ringSize;
popFront(&ring);
}
ThreadParams params = { &ring, packetBuffer };
HANDLE MessageThread = 0;
MessageThread = CreateThread(NULL, 0, HandleSendThread, ¶ms, 0, NULL);
if (MessageThread == NULL)
{
ExitProcess(MessageThread);
}
WaitForSingleObject(MessageThread, INFINITE);
CloseHandle(MessageThread);
system("pause");
return 0;
}
And my CreateThread function:
DWORD WINAPI HandleSendThread(LPVOID params)
{
ringBuffer * ring = ((ThreadParams*)params)->ptr1;
void * buffer = ((ThreadParams*)params)->ptr2;
//ring->bufferData[0].dataLen = sizeof(buffer) + sizeof(ring->bufferData[0])*1024;
printf("Shared memory check: ringBuffer data = \"%s\", \nlength = %d\n", (char*)ring->bufferData[0].data, ring->bufferData[0].dataLen);
return 0;
}
Found a solution
int main(int argc, char * argv[])
{
ringBuffer ring;
ringInitialization(&ring, RING_SIZE);
void * packetBuffer = malloc(BUFFER_SIZE * RING_SIZE);
Descriptor temp = { 0 };
uint8_t * currentBuffer = getPointer(packetBuffer, 0);
uint8_t * str = "Mr. and Mrs. Dursley, of number four, Privet Drive, were proud to say that they were perfectly normal, thank you very much. They were the last people you'd expect to be involved in anything strange or mysterious, because they just didn't hold with such nonsense. Mr.Dursley was the director of a firm called Grunnings, which made drills.He was a big, beefy man with hardly any neck, although he did have a very large mustache.Mrs.Dursley was thin and blonde and had nearly twice the usual amount of neck, which came in very useful as she spent so much of her time craning over garden fences, spying on the neighbors.The Dursleys had a small son called Dudley and in their opinion there was no finer boy anywhere.";
strcpy(currentBuffer, str);
temp.dataLen = strlen(str);
temp.data = currentBuffer;
pushBack(&ring, &temp);
ThreadParams params = { &ring, packetBuffer };
HANDLE MessageThread = 0;
MessageThread = CreateThread(NULL, 0, HandleSendThread, ¶ms, 0, NULL);
if (MessageThread == NULL)
{
ExitProcess(MessageThread);
}
WaitForSingleObject(MessageThread, INFINITE);
CloseHandle(MessageThread);
system("pause");
return 0;
}
DWORD WINAPI HandleSendThread(LPVOID params)
{
ringBuffer * ring = ((ThreadParams*)params)->ptr1;
void * buffer = ((ThreadParams*)params)->ptr2;
Descriptor * temp = &ring->bufferData[ring->head];
for (int i = 0; i < temp->dataLen; i++)
{
printf("%c", ((char*)temp->data)[i]);
}
printf("\n");
return 0;
}