#ifndef OS_FLAG_EN
#error  "OS_CFG.H, Missing OS_FLAG_EN: Enable (1) or Disable (0) code generation for Event Flags"
#else
    #ifndef OS_MAX_FLAGS
    #error  "OS_CFG.H, Missing OS_MAX_FLAGS: Max. number of Event Flag Groups in your application"
    #else
        #if     OS_MAX_FLAGS > 65500u
        #error  "OS_CFG.H, OS_MAX_FLAGS must be <= 65500"
        #endif
    #endif

    #ifndef OS_FLAGS_NBITS
    #error  "OS_CFG.H, Missing OS_FLAGS_NBITS: Determine #bits used for event flags, MUST be either 8, 16 or 32"
    #endif

    #ifndef OS_FLAG_WAIT_CLR_EN
    #error  "OS_CFG.H, Missing OS_FLAG_WAIT_CLR_EN: Include code for Wait on Clear EVENT FLAGS"
    #endif

    #ifndef OS_FLAG_ACCEPT_EN
    #error  "OS_CFG.H, Missing OS_FLAG_ACCEPT_EN: Include code for OSFlagAccept()"
    #endif

    #ifndef OS_FLAG_DEL_EN
    #error  "OS_CFG.H, Missing OS_FLAG_DEL_EN: Include code for OSFlagDel()"
    #endif

    #ifndef OS_FLAG_NAME_EN
    #error  "OS_CFG.H, Missing OS_FLAG_NAME_EN: Enable flag group names"
    #endif

    #ifndef OS_FLAG_QUERY_EN
    #error  "OS_CFG.H, Missing OS_FLAG_QUERY_EN: Include code for OSFlagQuery()"
    #endif
#endif

/*这段代码是 什么意思？有什么作用？