cpu_usage.rar_Linux共享内存

#include "OssCpuUsage.h" int32_t OssKwSysCpuShmid = -1; void *OssKwSysCpuShmidPtr = NULL; double get_cpu_use_rate(const struct cpu_usage_struct *cur, const struct cpu_usage_struct *old) { double user,sys,nice,idle,total,iowait,irq,softirq; double cpu_rate; user = (double)(cur->cpu_user - old->cpu_user); sys = (double)(cur->cpu_sys - old->cpu_sys); nice = (double)(cur->cpu_nice - old->cpu_nice); idle = (double)(cur->cpu_idle - old->cpu_idle); iowait = (double)(cur->cpu_iowait - old->cpu_iowait); irq = (double)(cur->cpu_irq - old->cpu_irq); softirq = (double)(cur->cpu_softirq - old->cpu_softirq); total = user + sys + nice + idle + iowait +irq + softirq; cpu_rate = (1-idle/total)*100; return cpu_rate; } double get_cpu_free_rate(const struct cpu_usage_struct *cur, const struct cpu_usage_struct *old) { double user,sys,nice,idle,total,iowait,irq,softirq; double free_rate; user = (double)(cur->cpu_user - old->cpu_user); sys = (double)(cur->cpu_sys - old->cpu_sys); nice = (double)(cur->cpu_nice - old->cpu_nice); idle = (double)(cur->cpu_idle - old->cpu_idle); iowait = (double)(cur->cpu_iowait - old->cpu_iowait); irq = (double)(cur->cpu_irq - old->cpu_irq); softirq = (double)(cur->cpu_softirq - old->cpu_softirq); total = user + sys + nice + idle + iowait + irq + softirq; free_rate = (idle /total)*100; return free_rate; } int get_cpuinfo_from_proc_stat(struct cpu_usage_struct *usage) { FILE *fp = NULL; char tmp[10]; fp = fopen(CPU_FILE_PROC_STAT,"r"); if(fp == NULL) { perror("fopen"); return -1; } fscanf(fp,"%s %lu %lu %lu %lu %lu %lu %lu",tmp,&(usage->cpu_user),&(usage->cpu_sys), &(usage->cpu_nice),&(usage->cpu_idle), &(usage->cpu_iowait), &(usage->cpu_irq), &(usage->cpu_softirq)); fclose(fp); return 1; } int main(int argc, const char *argv[]) { int time = 0; struct cpu_usage_struct *cur,*old; double use_rate,free_rate; ST_OSS_KW_CPU_USAGE *cpu_usage = NULL; if (argc == 1) { time = 500; } else { time = atoi(argv[1]); } old = (struct cpu_usage_struct*)malloc(sizeof(struct cpu_usage_struct)); if(old == NULL) { perror("malloc error"); return -1; } cur = (struct cpu_usage_struct*)malloc(sizeof(struct cpu_usage_struct)); if(cur == NULL) { perror("malloc error"); return -1; } if ((OssKwSysCpuShmid = shmget(OSS_KW_CPU_SHM_KEY, OSS_KW_CPU_SHM_BUF_SIZE, IPC_CREAT)) == -1) { printf("OssKwSysCpuInit(): shmget error! %s\n", strerror(errno)); return -1; } if ((OssKwSysCpuShmidPtr = shmat(OssKwSysCpuShmid, 0, 0)) == (void *)-1) { printf("OssKwSysCpuInit(): shmat error! %s\n", strerror(errno)); return -1; } cpu_usage = (ST_OSS_KW_CPU_USAGE *)OssKwSysCpuShmidPtr; while(1) { get_cpuinfo_from_proc_stat(old); usleep(time*1000); get_cpuinfo_from_proc_stat(cur); cpu_usage->ulUse = get_cpu_use_rate(cur,old); cpu_usage->ulFree = get_cpu_free_rate(cur,old); /* printf("use_rate:%lf,free_rate:%lf\n",cpu_usage->ulUse,cpu_usage->ulFree); */ } return 1; }