Ç訪問數組正確

Question

OS-sim.h

typedef enum { 
    PROCESS_NEW = 0, 
    PROCESS_READY, 
    PROCESS_RUNNING, 
    PROCESS_WAITING, 
    PROCESS_TERMINATED 
} process_state_t; 

typedef struct _pcb_t { 
    const unsigned int pid; 
    const char *name; 
    const unsigned int static_priority; 
    process_state_t state;    <<---Trying to access this 
    op_t *pc; 
    struct _pcb_t *next; 
} pcb_t; 

file1.c中

static pcb_t **current; 

extern void yield(unsigned int cpu_id) 
{ 
    /* FIX ME */ 
    while (1) 
    { 
    pthread_mutex_lock(&current_mutex); 
    current[cpu_id].state = PROCESS_WAITING; ///<-------ERROR HERE 
    pthread_mutex_unlock(&current_mutex); 
    break; 
    } 
    schedule(cpu_id); 
} 

in main method(): 
current = malloc(sizeof(pcb_t*) * 10); 

我有錯誤在這行current[cpu_id].state = PROCESS_WAITING;

error: request for member ‘state’ in something not a structure or union 

這個錯誤是什麼意思？
這是不是正確的方式來訪問當前數組持有pcb_t？
如果是這樣，我該如何訪問當前數組？和狀態字段？

Answer 1

你很可能在尋找：

current[cpu_id]->state = PROCESS_WAITING; 

類型的current是pcb_t **。所以current[cpu_id]的類型是pcb_t *。